Question 331756
Please show me how to use substitution to solve the system of equations;
5x+5y=-30 and 2x-y=15
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5x+5y=-30 --> x+y = -6  reduce whenever possible
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2x-y=15
Solve for y
y = 2x - 15
Sub for y into the 1st eqn
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x+y = -6
x + (2x-15) = -6
Solve for x.
Then sub the number for x and solve for y