Question

Use substitution to solve the system of equations.
5x + 5y = -30
2x - y = 15

(-2, 5)
(12, -5)
(3, -9)
(-2, 10)

Answer 1

<3 every one is looking at this question

Answer 2

all 3 of us... :)

Answer 3

there was like 5 of my friends looking now only 2 :(

Answer 4

Isolate one of the variables in an equation

Answer 5

what are the numbers in the () for?

Answer 6

think those are answer choices

Answer 7

Let me post ss

Answer 8

Yes they are gand

Answer 9

In the 2nd x=15+y/2 Take that x to the 1st

Answer 10

3,-9

Answer 11

So... first, isolate a variable.
lets do x caus x is fun
5x+5y=-30
5x=-30-5y
x=-6-y

Answer 12

(3, -9)

Answer 13

now, wherever u c an x in the second equation, plug in -6-y
solve for y

Answer 14

2(-6-y)-y=15
-12-2y-y=15
-12-3y=15
-3y=27
y=-9

Answer 15

Now plug that into an equation and solve for x

Answer 16

:O you lost me

Answer 17

which part?

Answer 18

idk where you got 2(-6-y)-y=15
-12-2y-y=15

Answer 19

whats 2*-6 and 2*-y

Answer 20

it's and x not *

Answer 21

okay... you see where I got the first equation equal to x?
x=-6-y
-6-y is x
so wherever u see an x, u can put in -6-y, because they're the same thing

Answer 22

got it or still confused or did I do the wrong part...

Answer 23

i think i got it but i don't get how to go from there :'(

Answer 24

okay.
2x-y=15
2(-6-y)-y=15

Answer 25

distribute the 2

Answer 26

(3,-9)

Answer 27

-12-2y-y=15

Answer 28

with me so far?

Answer 29

i kinda am lost on the steps but i kinda get what your doing

Answer 30

K. want me to back up and show you again or keep going?

Answer 31

:S idk brb i have to help my dad -_-

Answer 32

k, c u l8r