Question

What are the solution of the following system X-y=-4 / 4x-4y=-16

Answer 1

Solve equation [1] for the variable y

[1] y = -x - 4

Plug this in for variable y in equation [2]

[2] 4x - 4•(-x -4) = 16

[2] 8x = 0

Solve equation [2] for the variable x

[2] 8x = 0

[2] x = 0

By now we know this much :

x = 0

y = -x-4

Use the x value to solve for y

y = -(-0/32766)-4 = -4

Solution :

{x,y} = {0/32766,-4}

{x,y} = {0,-4}