Question

solve...simultaneous equations
3x+4y=16
6x+15y=-6

Answer 1

i already got to the answer -11y=22
wat happens now??

Answer 2

Well, you said you got the answer, but let me do it over, and see if you are right.:)

Answer 3

ta!!!
but is till need to find out wat x is

Answer 4

Oh, I see, okay, let me do this step by step.

Ok, first we have to get either the x's or y's to cancel out, so lets multiply the first equation by 2 to cancel out the x's.

Answer 5

oh sorry i meant wat y is

Answer 6

3x + 4y = 16
x 2 x 2 x2

Ok, so we have now:
6x + 8y = 32
6x + 15y = -6

Ok, now what does the equations look like after canceling out the x's?

Answer 7

@chayareisner And by canceling out the x's, we make it possible to solve for y.

Answer 8

thnx but ive already got -11y=22
i need to find one y

Answer 9

Ok, well from there, you divide both sides by -11 to find y.

-11y = 22
/-11 /-11

Answer 10

rite so 22 share by -11
is it -2??

Answer 11

Yup! y = -2

Answer 12

Now substitute y for -2 to solve for x.

Answer 13

ye ill do that alone thnx!!!