Question

Solve the equation by substitution
y = -8x + 4
4x – 4y = -16

Answer 1

y = -8x + 4

4x – 4y = -16

replace y in the 2nd equation

4x-4(-8x+4)=-16

4x+32x-16=-16

32x=-16+16

x= 0

calculate y:

y= -8*0+4

y= 4

solutions {0,4}

Explanation: