Step-by-step explanation:
f(x) = 8 - 3x
when x =3, then
f(3) = 8 - 3×3
=8-9
=-1
Answer:
2
Step-by-step explanation:
Vertical angles have equal measure so:-
9x + 12 = 3x + 24
6x = 12
x = 2
A. (-2, -3) should be the answer.

![\bf -\cfrac{1}{4}(y+2)^2=(x-1)\implies (y+2)^2={-4}(x-1) \\\\\\\ [y-(-2)]^2=-4(x-1)\quad \begin{cases} k=-2\\ h=1\\ 4p=-4 \end{cases}\implies 4p=-4\implies \boxed{p=-1}](https://tex.z-dn.net/?f=%5Cbf%20-%5Ccfrac%7B1%7D%7B4%7D%28y%2B2%29%5E2%3D%28x-1%29%5Cimplies%20%28y%2B2%29%5E2%3D%7B-4%7D%28x-1%29%0A%5C%5C%5C%5C%5C%5C%5C%0A%5By-%28-2%29%5D%5E2%3D-4%28x-1%29%5Cquad%20%0A%5Cbegin%7Bcases%7D%0Ak%3D-2%5C%5C%0Ah%3D1%5C%5C%0A4p%3D-4%0A%5Cend%7Bcases%7D%5Cimplies%204p%3D-4%5Cimplies%20%5Cboxed%7Bp%3D-1%7D)
so, is a horizontal parabola, the "p" distance is 1, however, we ended up with a negative value, that means, the parabola is opening to the left-hand-side, with a vertex at (1, -2), and its focus at 0, -2, like you see in the picture below, one unit to the left of the vertex.