Im not sure but I think you add
Ah, good ol' substitution. You need to take the phrase y+2 and replace every x with it. Then solve for y.
y=(y+2)^3-4(y+2)^2-6(y+2)+8
Substitue y with the first equation.
x+3=2x+5 (Subtract x on the left sides from both sides.)
3=x+5 (Subtract 5 from both sides.)
x=-2
Fractions and percents are simply.different ways to express a ratio between two numbers.
