y=2z-4

Rewrite the equation as 2z-4=y.

2z-4=y

Add 4 to both sides of the equation.

2z=y+4

Divide each term in 2z=y+4 by 2.

2z2=y2+42

Cancel the common factor of 2.

Cancel the common factor.

2z2=y2+42

Divide z by 1.

z=y2+42

z=y2+42

Divide 4 by 2.

z=y2+2

z=y2+2

Solve for z y=2z-4