// Solve equation [1] for the variable y
[1] y = -3x + 17
// Plug this in for variable y in equation [2]
[2] 4x - (-3x+17) = 18
[2] 7x = 35
// Solve equation [2] for the variable x
[2] 7x = 35
[2] x = 5 // By now we know this much :
x = 5
y = -3x+17// Use the x value to solve for y
y = -3(5)+17 = 2 Solution :
{x,y} = {5,2}
Is the answer
