Question

The system of equations represented by x+2y=2 and -4x+3y=25 intersects at (a,b). What does -2(a+b)=?
a)2
b)4
c)12
d)24
E)30

Answer 1

x+2y=2
-4x+3y=25

solve for y and x by elimination or substitution or graphing.

then.

you plug into that formula

-2(x+y)

Answer 2

whats substitution again... :)

Answer 3

substitution is a method in which you find a variable in terms of other (from one equation) and then substitute it in another equation
say in this ques x = 2-2y (from 1st eq)
so put this value of x in second and solve for x

then take this value of x and put it in any of the eq to get y

Answer 4

i get y=3 and x=-4 so the final answer i get is 2.... so is the answer "A" which is 2 ?

Answer 5

pleaseeeeeeee someone is the answer "A" which is 2

Answer 6

-2(a+b) = -2(3+(-4))= -2(3-4) = -6+8=2
2 is your answer , so that is correct.
However, do A and B necessarily signify X and Y?

Answer 7

okay you lost me at your question... "However, do A and B necessarily signify X and Y?"

Answer 8

p.s- thank you for your reply
!