Answer:
y = x² - 2 is not linear (see plot)
Step-by-step explanation:
y = -4x - 12 has slope -4 and y intercept 12, linear
y = 5x has slope 5 and y intercept 0, linear
y = 17 has slope 0 and y intercept 17, linear
y=17, because a linear function needs an x and y and at least two points. This is just one point.
