Question

I have no Clue on how to do this one.
Given equation A as and equation B as , which expression will give the value of y?

Answer 1

the first

Answer 2

do you want an explanation?

Answer 3

Yes, PLEASE

Answer 4

okay so you know how to add and subtract entire equations?

Answer 5

yup

Answer 6

great! now what we need to do in this is to eliminate x by adding or subtracting those two equations. but first we need the x-terms to be equal, we do that by multiplying B by 3. are you with me so far?

Answer 7

yea, gotta find the lcd/lcm to knock them out right?

Answer 8

yup! and then just subtract the new B (the one multiplied by three 3B) from A to get rid of the x term and end up with only y!

Answer 9

so what will happen is:
\[3(\frac{ 2 }{ 3 }x-y) = 2x-3y\]
\[(2x+(1/4)y)-(2x-3y)\]
=> \[(13/4)y\]

Answer 10

so it's A-3B