The easiest way to do this is to multiple 7 and 3, which gives you 21. Julie will spend $21 on the gifts.
F(x)=x+c, where c is an arbitrary constant.
if c is positive then translation above
if c is negative then translation down
reflection of f(x)=x^2 across x-axis then
f(x)=-x^2
I am assuming you want to solve for m in each case
8n = -3m + 1
8(-2) = -3m + 1
-16 = -3m + 1
-3m = -17
m =
8(2) = -3m + 1
16 = -3m + 1
-3m = 15
m = -5
8(4) = -3m + 1
32 = -3m + 1
-3m = 31
m =
Answer is the first one on left
Well, the interseciton of 2 planes would be a line, so it would be like line AB when it goes through the 2 points A and B