Problem: Solve the given linear equations and select the correct answer from the provided options.
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Step-by-Step Solution:
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Question 1: Solve the linear equation \( x - 15 = -19 \)
1. Start with the equation:
\[
x - 15 = -19
\]
2. To isolate \( x \), add 15 to both sides of the equation:
\[
x - 15 + 15 = -19 + 15
\]
3. Simplify:
\[
x = -4
\]
4. The solution is:
\[
x = -4
\]
5. Match the solution with the given options:
- A: \( x = 34 \)
- B: \( x = -34 \)
- C: \( x = -4 \)
- D: \( x = 4 \)
The correct answer is
C.
---
Question 2: Solve the linear equation \( -12y = 108 \)
1. Start with the equation:
\[
-12y = 108
\]
2. To isolate \( y \), divide both sides by \(-12\):
\[
y = \frac{108}{-12}
\]
3. Simplify the division:
\[
y = -9
\]
4. The solution is:
\[
y = -9
\]
5. Match the solution with the given options:
- A: \( y = -120 \)
- B: \( y = -9 \)
- C: \( y = 9 \)
- D: \( y = 120 \)
The correct answer is
B.
---
Question 3: Solve the linear equation \( \frac{x}{7} = -8 \)
1. Start with the equation:
\[
\frac{x}{7} = -8
\]
2. To isolate \( x \), multiply both sides by 7:
\[
x = -8 \times 7
\]
3. Simplify the multiplication:
\[
x = -56
\]
4. The solution is:
\[
x = -56
\]
5. Match the solution with the given options:
- A: \( x = -56 \)
- B: \( x = -15 \)
- C: \( x = 56 \)
- D: \( x = 15 \)
The correct answer is
A.
---
Question 4: Solve the linear equation \( \frac{x}{7} = -8 \)
1. Start with the equation:
\[
\frac{x}{7} = -8
\]
2. To isolate \( x \), multiply both sides by 7:
\[
x = -8 \times 7
\]
3. Simplify the multiplication:
\[
x = -56
\]
4. The solution is:
\[
x = -56
\]
5. Match the solution with the given options:
- A: \( x = 56 \)
- B: \( x = -56 \)
- C: \( x = -15 \)
- D: \( x = 15 \)
The correct answer is
B.
---
Question 5: Solve the linear equation \( \frac{3}{4}x = 27 \)
1. Start with the equation:
\[
\frac{3}{4}x = 27
\]
2. To isolate \( x \), multiply both sides by the reciprocal of \( \frac{3}{4} \), which is \( \frac{4}{3} \):
\[
x = 27 \times \frac{4}{3}
\]
3. Simplify the multiplication:
\[
x = \frac{27 \times 4}{3} = \frac{108}{3} = 36
\]
4. The solution is:
\[
x = 36
\]
5. Match the solution with the given options:
- A: \( x = -20 \frac{1}{4} \)
- B: \( x = 20 \frac{1}{4} \)
Note: The options provided do not match the solution. However, if we assume a typo in the options, the correct answer should be \( x = 36 \).
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Parent Tip: Review the logic above to help your child master the concept of linear equation in one variable worksheet.