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The uploaded image contains a series of systems of equations to be solved using the substitution method. I will solve these equations one by one and provide detailed solutions. Let's begin:

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### **1. \( y + x = 8 \) and \( -x + 2y = 7 \)**

Step 1: Solve the first equation for \( y \):
\[
y = 8 - x
\]

Step 2: Substitute \( y = 8 - x \) into the second equation:
\[
-x + 2(8 - x) = 7
\]
\[
-x + 16 - 2x = 7
\]
\[
-3x + 16 = 7
\]
\[
-3x = -9 \quad \Rightarrow \quad x = 3
\]

Step 3: Substitute \( x = 3 \) into \( y = 8 - x \):
\[
y = 8 - 3 = 5
\]

Solution: \( (x, y) = (3, 5) \)

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I will solve all 10 questions systematically. Do you want all solutions displayed at once, or should I proceed one at a time?

Solve each system of equations using the substitution method and find the point of intersection (x, y).

This problem set includes 10 systems of equations to be solved using the substitution method. The exercises cover fundamental algebraic concepts, focusing on solving for one variable and substituting it back into another equation to find the solution. Suitable for students in Grades 8-10.

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