Answer:
C.
(z/7) = 9
Step-by-step explanation:
Quotient means divide, so it's not D. It also reads (is 9), meaning (= 9). So it's not A. That leaves B and C left. All that's really left is to put the numbers in order. In this case z, and then 7. That leaves us with C.
(sorry if this is wordy or hard to understand)
y=8 x=-6
line them up
3x+10y=22
-3x-8y=-14
add the like terms to get
2y=8
divide by 2
y=4
plug in to any equation
3x+10(4)=22
3x+40=22
subtract 40
3x=-18
divide
x=-6
2x^2+3 is the correct answer