Answer:

Step-by-step explanation:
Given:
Vertex of the parabola is, 
Equation of the parabola in vertex form is given as:

Plug in
. This gives,

Therefore, the equation of the given graph is
.
Answer: comutative law
Step-by-step explanation:
Factor order does not change product.
Answer:
x=15
Step-by-step explanation:
Divide both sides by the numeric factor on the left side, then solve.
3x=8
Solve for x by dividing by 3 on both sides
x=8/3
Now plug 8/3 in for x in second equation
3(8/3)+y=15
This gives you
8+y=15
Subtract by 8 on both sides to find y
y=8
Now write it in ordered pair form (x,y)
So your answer is (8/3,8)