Question

Solve the systemSolve the system by either substitution or elimination 4x + 4y = 20, 2x -2y = -18 by either substitution or elimination

Answer 1

{4x + 4y = 20  | ÷4
{2x -2y = -18   | ÷2

{x + y = 5 
{x -y = -9
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2x = -4
x = -2

x + y = 5 
-2 + y = 5
y = 5 + 2
y = 7

The answer is (-2, 7)