Answer:
4, 8) and (-2, -4)
Explanation:
y = x² - 8 and y = 2x .
Substitute y = 2x into the first equation.
2x = x² - 8
0 = x² - 2x - 8 Add -2x to both sides.
0 = ( x - 4)(x + 2) Factor
0 = x - 4 ; 0 = x + 2
x = 4 ; x = - 2
Solve y = 2x when x = 4 solve y = 2x when x = -2
y = 2(4) y = 2(-2)
y = 8 y = -4
(4, 8) and (-2, -4)