Question

The system of equations represented by x+2y=2 & -4x+3y=25 intersects at (a,b). What does -2(a+b)=?

Answer 1

what did you get for a and b

Answer 2

unfortunately that is incorrect

Answer 3

sorry one sec

Answer 4

first you solve x+2y=2 for x

x+2y=2

x=2-2y

Answer 5

then you plug it into -4x+3y=25 and solve for y

-4x+3y=25

-4(2-2y)+3y=25

-8+8y+3y=25

....
....
....

y = ???

Answer 6

correct, now use that to find x

Answer 7

perfect

Answer 8

you got it

Answer 9

so a = -4, b = 3

Answer 10

very nice

Answer 11

you're welcome