Answer:
NOT linear
Explanation:
Your equation is:
y = x^2 - x
Since the y has no exponent, (which is a power of 1) and the x has an exponent of 2, this function is a parabola. It is not linear. (Linear functions have a graph that is a line)
Functions that are NOT linear have exponents greater than 1, or variables in the denominator, or, variables inside a radical.