Explain whether y = x2 – 1 is a linear equation

Step-by-step explanation:

A linear equation looks like any other equation. It is made up of two expressions set equal to each other. A linear equation is special because: It has one or two variables. No variable in a linear equation is raised to a power greater than 1 or used as the denominator of a fraction

-4

Step-by-step explanation:

you plug in f(7) as the x

so it would be f=10-14

so the answer is -4