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PROBLEM

5. y=2x+2y=7x+11\begin{aligned} y & =-2 x+2 \\ & y=7 x+11\end{aligned}

STEP 1

1. We are given a system of two linear equations.
2. The goal is to find the values of x x and y y that satisfy both equations simultaneously.
3. We will use the substitution method to solve the system.

STEP 2

1. Set the equations equal to each other.
2. Solve for x x .
3. Substitute the value of x x back into one of the original equations to find y y .
4. Verify the solution by checking both equations.

STEP 3

Since both equations are equal to y y , we can set them equal to each other:
2x+2=7x+11 -2x + 2 = 7x + 11

STEP 4

To solve for x x , first get all terms involving x x on one side of the equation and constant terms on the other:
2x7x=112 -2x - 7x = 11 - 2

STEP 5

Combine like terms:
9x=9 -9x = 9

STEP 6

Divide both sides by 9-9 to solve for x x :
x=1 x = -1

STEP 7

Substitute x=1 x = -1 back into one of the original equations to find y y . We'll use the first equation:
y=2(1)+2 y = -2(-1) + 2

STEP 8

Simplify the equation:
y=2+2=4 y = 2 + 2 = 4

STEP 9

Verify the solution by substituting x=1 x = -1 and y=4 y = 4 into the second equation:
y=7(1)+11 y = 7(-1) + 11

SOLUTION

Simplify the equation:
4=7+11 4 = -7 + 11 4=4 4 = 4 Both sides are equal, confirming our solution is correct.
The solution to the system of equations is:
x=1,y=4 x = -1, \quad y = 4

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