Question

-4x-15y=-17
-x+5y=-13
i have to find x and y by elimination please show work !!

Answer 1

First multiply both sides of equation 2 by 3 to get

-x+5y=-13

3(-x+5y) = 3(-13)

-3x + 15y = -39

---------------------------

So we now have this new system

-4x - 15y = -17
-3x + 15y = -39


Now add the two equations to get this


-4x - 15y = -17
-3x + 15y = -39
---------------
-7x + 0y = -56


which means -7x = -56 ----> x = ???

Answer 2

8??

Answer 3

good x = 8

now plug that into -x+5y=-13 and solve for y

Answer 4

-1??

Answer 5

perfect

so x = 8 and y = -1

Answer 6

awesoommmmmeee is it possible that i cud multiply both equations by a number

Answer 7

you could, but it would take more work

also, the numbers would have to be different

Answer 8

oo i c