Question

Given equation A as 2x+1/4y=3 and equation B as 2/3x-y=6, which expression will give the value of y?

Answer 1

A. a-3b
B. a-3/2b
C. 2a-3b
D. 1/3a+b

Answer 2

it looks like they are asking how to combine equation A and equation B to eliminate the x variable
eq A is 2x+1/4y=3
eq B is 2/3x-y=6

if you multiply eq B by -3 (that means both sides, and all terms) you get
-3*⅔ x + -3*-y = -3*6
that simplifies to
-2x + 3y = -18
what do you get if you add that to eq A ?

Answer 3

3 1/4y=-15

Answer 4

and the point is we can solve for y ... write 3 ¼ as 13/4 to get
13/4 y = -15
then multiply both sides by 4/13 to solve for y
y = -15*4/13

but we don't need to find y, we just need to answer the question
equation A - 3 equation B allows us to solve for y

Answer 5

thank you

Answer 6

yw