Y=-2x^2+8x-8 What is the vertex

Vertex is (2,0)

Step-by-step explanation:

The vertex of a parabola is x=-b/2a

Since a=-2 and b=8, we have:

x=-8/2(-2)

x=-8/-4

x=2

So the vertex is (2,0)

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18

it is true

step-by-step explanation:

all the combinations add up i used   calculator