Answer:
{x,y}={-4,-3}
Step-by-step explanation:
// Solve equation [1] for the variable y
[1] y = 2x + 5
// Plug this in for variable y in equation [2]
[2] -4x + 3•(2x+5) = 7
[2] 2x = -8
// Solve equation [2] for the variable x
[2] 2x = - 8
[2] x = - 4
// By now we know this much :
x = -4
y = 2x+5
// Use the x value to solve for y
y = 2(-4)+5 = -3
Solution :
{x,y} = {-4,-3}
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