Subtract the polynomial

What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Follow these steps using the algebra tiles to solve the equation −5x + (−2) = −2x + 4. 1. add 5 positive x-tiles to both sides and create zero pairs. 2. add 4 negative unit tiles to both sides and create zero pairs. 3. divide the unit tiles evenly among the x-tiles. x =

What is the value of f(x) = 2.2 for f(-2)?