Let's solve each graph step by step to find the
slope-intercept form of the line:
$$
y = mx + b
$$
where:
- $ m $ is the
slope
- $ b $ is the
y-intercept
We'll analyze each graph one at a time.
---
🔹 Graph 1 (Top Left)
Step 1: Find the y-intercept (b)
The line crosses the y-axis at $ y = 2 $.
So,
y-intercept = 2
Step 2: Find the slope (m)
Pick two points on the line. From the graph:
- At $ x = 0 $, $ y = 2 $
- At $ x = 4 $, $ y = 0 $
Slope $ m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{0 - 2}{4 - 0} = \frac{-2}{4} = -\frac{1}{2} $
✔ Slope = $-\frac{1}{2}$,
y-intercept = 2
Equation:
$$
y = -\frac{1}{2}x + 2
$$
---
🔹 Graph 2 (Top Middle)
Step 1: y-intercept
Line passes through $ (0, 1) $ →
y-intercept = 1
Step 2: Slope
From $ (0,1) $ to $ (1,3) $:
$ m = \frac{3 - 1}{1 - 0} = \frac{2}{1} = 2 $
✔ Slope = 2,
y-intercept = 1
Equation:
$$
y = 2x + 1
$$
---
🔹 Graph 3 (Top Right)
Step 1: y-intercept
The line crosses the y-axis at $ y = 0 $ →
y-intercept = 0
Step 2: Slope
Points: $ (0,0) $ and $ (4,-2) $
$ m = \frac{-2 - 0}{4 - 0} = \frac{-2}{4} = -\frac{1}{2} $
✔ Slope = $-\frac{1}{2}$,
y-intercept = 0
Equation:
$$
y = -\frac{1}{2}x
$$
---
🔹 Graph 4 (Bottom Left)
Step 1: y-intercept
Crosses y-axis at $ y = -2 $ →
y-intercept = -2
Step 2: Slope
From $ (0,-2) $ to $ (2,2) $:
$ m = \frac{2 - (-2)}{2 - 0} = \frac{4}{2} = 2 $
✔ Slope = 2,
y-intercept = -2
Equation:
$$
y = 2x - 2
$$
---
🔹 Graph 5 (Bottom Middle)
Step 1: y-intercept
Crosses y-axis at $ y = 3 $ →
y-intercept = 3
Step 2: Slope
From $ (0,3) $ to $ (3,0) $:
$ m = \frac{0 - 3}{3 - 0} = \frac{-3}{3} = -1 $
✔ Slope = -1,
y-intercept = 3
Equation:
$$
y = -x + 3
$$
---
🔹 Graph 6 (Bottom Right)
Step 1: y-intercept
Crosses y-axis at $ y = 1 $ →
y-intercept = 1
Step 2: Slope
From $ (0,1) $ to $ (2,3) $:
$ m = \frac{3 - 1}{2 - 0} = \frac{2}{2} = 1 $
✔ Slope = 1,
y-intercept = 1
Equation:
$$
y = x + 1
$$
---
✔ Final Answers:
#### Graph 1:
- Slope = $-\frac{1}{2}$
- y-intercept = 2
- Equation: $ y = -\frac{1}{2}x + 2 $
#### Graph 2:
- Slope = 2
- y-intercept = 1
- Equation: $ y = 2x + 1 $
#### Graph 3:
- Slope = $-\frac{1}{2}$
- y-intercept = 0
- Equation: $ y = -\frac{1}{2}x $
#### Graph 4:
- Slope = 2
- y-intercept = -2
- Equation: $ y = 2x - 2 $
#### Graph 5:
- Slope = -1
- y-intercept = 3
- Equation: $ y = -x + 3 $
#### Graph 6:
- Slope = 1
- y-intercept = 1
- Equation: $ y = x + 1 $
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Parent Tip: Review the logic above to help your child master the concept of hard algebra y mx b worksheet.