t=x-2y

Rewrite the equation as x-2y=t.

x-2y=t

Subtract x from both sides of the equation.

-2y=t-x

Divide each term in -2y=t-x by -2.

-2y-2=t-2+-x-2

Cancel the common factor of -2.

Cancel the common factor.

-2y-2=t-2+-x-2

Divide y by 1.

y=t-2+-x-2

y=t-2+-x-2

Simplify each term.

Move the negative in front of the fraction.

y=-t2+-x-2

Dividing two negative values results in a positive value.

y=-t2+x2

y=-t2+x2

y=-t2+x2

Solve for y t=x-2y