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Step-by-step solution for: Point slope form worksheet: Fill out & sign online | DocHub
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Show Answer Key & Explanations
Step-by-step solution for: Point slope form worksheet: Fill out & sign online | DocHub
Let's solve each problem step by step using the point-slope form of a line:
The point-slope form of a line is:
$$
y - y_1 = m(x - x_1)
$$
where:
- $ m $ is the slope,
- $ (x_1, y_1) $ is a point on the line.
---
#### 1. Passes through (2, 3) and has slope of $-\frac{1}{2}$
Use $ m = -\frac{1}{2} $, $ (x_1, y_1) = (2, 3) $
$$
y - 3 = -\frac{1}{2}(x - 2)
$$
✔ Answer: $ y - 3 = -\frac{1}{2}(x - 2) $
---
#### 2. Passes through (-1, 4) and $ m = 4 $
$$
y - 4 = 4(x + 1)
$$
✔ Answer: $ y - 4 = 4(x + 1) $
---
#### 3. Passes through (0, 2) and has slope of $-\frac{5}{3}$
$$
y - 2 = -\frac{5}{3}(x - 0)
$$
Simplify:
$$
y - 2 = -\frac{5}{3}x
$$
✔ Answer: $ y - 2 = -\frac{5}{3}x $
---
#### 4. Passes through (4, -2) and $ m = 0 $
A slope of 0 means a horizontal line.
$$
y + 2 = 0(x - 4)
$$
$$
y + 2 = 0 \quad \Rightarrow \quad y = -2
$$
But we want point-slope form, so:
$$
y + 2 = 0(x - 4)
$$
✔ Answer: $ y + 2 = 0(x - 4) $
---
#### 5. Passes through (-4, 6) and (-2, 5)
First, find the slope $ m $:
$$
m = \frac{5 - 6}{-2 - (-4)} = \frac{-1}{2} = -\frac{1}{2}
$$
Now use one point, say $(-4, 6)$:
$$
y - 6 = -\frac{1}{2}(x + 4)
$$
✔ Answer: $ y - 6 = -\frac{1}{2}(x + 4) $
---
#### 6. Passes through (-1, -7) and (1, 3)
Find slope:
$$
m = \frac{3 - (-7)}{1 - (-1)} = \frac{10}{2} = 5
$$
Use point $(-1, -7)$:
$$
y + 7 = 5(x + 1)
$$
✔ Answer: $ y + 7 = 5(x + 1) $
---
We are given equations in point-slope form. Recall:
$$
y - y_1 = m(x - x_1)
$$
So:
- The number multiplied by $ (x - x_1) $ is the slope $ m $.
- The point is $ (x_1, y_1) $, found from $ (x - x_1) $ and $ y - y_1 $.
---
#### 7. $ y + 2 = \frac{2}{3}(x - 4) $
Rewrite as: $ y - (-2) = \frac{2}{3}(x - 4) $
- Slope $ m = \frac{2}{3} $
- Point: $ (4, -2) $
✔ Slope: $ \frac{2}{3} $, Point: $ (4, -2) $
---
#### 8. $ y - 3 = \frac{1}{2}(x - 3) $
- Slope $ m = \frac{1}{2} $
- Point: $ (3, 3) $
✔ Slope: $ \frac{1}{2} $, Point: $ (3, 3) $
---
#### 9. $ y + 5 = \frac{1}{4}(x + 2) $
Rewrite: $ y - (-5) = \frac{1}{4}(x - (-2)) $
- Slope $ m = \frac{1}{4} $
- Point: $ (-2, -5) $
✔ Slope: $ \frac{1}{4} $, Point: $ (-2, -5) $
---
#### 10. $ y = 2(x + 3) $
Rewrite: $ y - 0 = 2(x + 3) $ → $ y - 0 = 2(x - (-3)) $
- Slope $ m = 2 $
- Point: $ (-3, 0) $
✔ Slope: $ 2 $, Point: $ (-3, 0) $
---
#### 11. $ y - 8 = -3(x + 1) $
Rewrite: $ y - 8 = -3(x - (-1)) $
- Slope $ m = -3 $
- Point: $ (-1, 8) $
✔ Slope: $ -3 $, Point: $ (-1, 8) $
---
#### 12. $ y + 3 = -\frac{1}{5}x $
Rewrite: $ y - (-3) = -\frac{1}{5}(x - 0) $
- Slope $ m = -\frac{1}{5} $
- Point: $ (0, -3) $
✔ Slope: $ -\frac{1}{5} $, Point: $ (0, -3) $
---
#### Part 1: Equations in Point-Slope Form
1. $ y - 3 = -\frac{1}{2}(x - 2) $
2. $ y - 4 = 4(x + 1) $
3. $ y - 2 = -\frac{5}{3}x $
4. $ y + 2 = 0(x - 4) $
5. $ y - 6 = -\frac{1}{2}(x + 4) $
6. $ y + 7 = 5(x + 1) $
#### Part 2: Slope and Point
7. Slope: $ \frac{2}{3} $, Point: $ (4, -2) $
8. Slope: $ \frac{1}{2} $, Point: $ (3, 3) $
9. Slope: $ \frac{1}{4} $, Point: $ (-2, -5) $
10. Slope: $ 2 $, Point: $ (-3, 0) $
11. Slope: $ -3 $, Point: $ (-1, 8) $
12. Slope: $ -\frac{1}{5} $, Point: $ (0, -3) $
---
Let me know if you'd like these converted to slope-intercept form too!
🔹 Point-Slope Form:
The point-slope form of a line is:
$$
y - y_1 = m(x - x_1)
$$
where:
- $ m $ is the slope,
- $ (x_1, y_1) $ is a point on the line.
---
✔ Part 1: Write an equation in point-slope form
#### 1. Passes through (2, 3) and has slope of $-\frac{1}{2}$
Use $ m = -\frac{1}{2} $, $ (x_1, y_1) = (2, 3) $
$$
y - 3 = -\frac{1}{2}(x - 2)
$$
✔ Answer: $ y - 3 = -\frac{1}{2}(x - 2) $
---
#### 2. Passes through (-1, 4) and $ m = 4 $
$$
y - 4 = 4(x + 1)
$$
✔ Answer: $ y - 4 = 4(x + 1) $
---
#### 3. Passes through (0, 2) and has slope of $-\frac{5}{3}$
$$
y - 2 = -\frac{5}{3}(x - 0)
$$
Simplify:
$$
y - 2 = -\frac{5}{3}x
$$
✔ Answer: $ y - 2 = -\frac{5}{3}x $
---
#### 4. Passes through (4, -2) and $ m = 0 $
A slope of 0 means a horizontal line.
$$
y + 2 = 0(x - 4)
$$
$$
y + 2 = 0 \quad \Rightarrow \quad y = -2
$$
But we want point-slope form, so:
$$
y + 2 = 0(x - 4)
$$
✔ Answer: $ y + 2 = 0(x - 4) $
---
#### 5. Passes through (-4, 6) and (-2, 5)
First, find the slope $ m $:
$$
m = \frac{5 - 6}{-2 - (-4)} = \frac{-1}{2} = -\frac{1}{2}
$$
Now use one point, say $(-4, 6)$:
$$
y - 6 = -\frac{1}{2}(x + 4)
$$
✔ Answer: $ y - 6 = -\frac{1}{2}(x + 4) $
---
#### 6. Passes through (-1, -7) and (1, 3)
Find slope:
$$
m = \frac{3 - (-7)}{1 - (-1)} = \frac{10}{2} = 5
$$
Use point $(-1, -7)$:
$$
y + 7 = 5(x + 1)
$$
✔ Answer: $ y + 7 = 5(x + 1) $
---
✔ Part 2: Give the slope and a point on each line
We are given equations in point-slope form. Recall:
$$
y - y_1 = m(x - x_1)
$$
So:
- The number multiplied by $ (x - x_1) $ is the slope $ m $.
- The point is $ (x_1, y_1) $, found from $ (x - x_1) $ and $ y - y_1 $.
---
#### 7. $ y + 2 = \frac{2}{3}(x - 4) $
Rewrite as: $ y - (-2) = \frac{2}{3}(x - 4) $
- Slope $ m = \frac{2}{3} $
- Point: $ (4, -2) $
✔ Slope: $ \frac{2}{3} $, Point: $ (4, -2) $
---
#### 8. $ y - 3 = \frac{1}{2}(x - 3) $
- Slope $ m = \frac{1}{2} $
- Point: $ (3, 3) $
✔ Slope: $ \frac{1}{2} $, Point: $ (3, 3) $
---
#### 9. $ y + 5 = \frac{1}{4}(x + 2) $
Rewrite: $ y - (-5) = \frac{1}{4}(x - (-2)) $
- Slope $ m = \frac{1}{4} $
- Point: $ (-2, -5) $
✔ Slope: $ \frac{1}{4} $, Point: $ (-2, -5) $
---
#### 10. $ y = 2(x + 3) $
Rewrite: $ y - 0 = 2(x + 3) $ → $ y - 0 = 2(x - (-3)) $
- Slope $ m = 2 $
- Point: $ (-3, 0) $
✔ Slope: $ 2 $, Point: $ (-3, 0) $
---
#### 11. $ y - 8 = -3(x + 1) $
Rewrite: $ y - 8 = -3(x - (-1)) $
- Slope $ m = -3 $
- Point: $ (-1, 8) $
✔ Slope: $ -3 $, Point: $ (-1, 8) $
---
#### 12. $ y + 3 = -\frac{1}{5}x $
Rewrite: $ y - (-3) = -\frac{1}{5}(x - 0) $
- Slope $ m = -\frac{1}{5} $
- Point: $ (0, -3) $
✔ Slope: $ -\frac{1}{5} $, Point: $ (0, -3) $
---
✔ Final Answers Summary
#### Part 1: Equations in Point-Slope Form
1. $ y - 3 = -\frac{1}{2}(x - 2) $
2. $ y - 4 = 4(x + 1) $
3. $ y - 2 = -\frac{5}{3}x $
4. $ y + 2 = 0(x - 4) $
5. $ y - 6 = -\frac{1}{2}(x + 4) $
6. $ y + 7 = 5(x + 1) $
#### Part 2: Slope and Point
7. Slope: $ \frac{2}{3} $, Point: $ (4, -2) $
8. Slope: $ \frac{1}{2} $, Point: $ (3, 3) $
9. Slope: $ \frac{1}{4} $, Point: $ (-2, -5) $
10. Slope: $ 2 $, Point: $ (-3, 0) $
11. Slope: $ -3 $, Point: $ (-1, 8) $
12. Slope: $ -\frac{1}{5} $, Point: $ (0, -3) $
---
Let me know if you'd like these converted to slope-intercept form too!
Parent Tip: Review the logic above to help your child master the concept of writing equations in point slope form worksheet answers.