Question

x+3y=-28
y=-5x
This is what I've come up with so far
since x=1 i'll use that
1(5x)+3y=-28

Answer 1

Timesing 1*5 gives me
5x+3y=-28

Answer 2

so now whaht?

Answer 3

just substitute the y for -5x
you did it to the x

Answer 4

So I do
5x+3(-5)=-28?

Answer 5

so 5x-15=-28?

Answer 6

This doesn't look right

Answer 7

You still need to solve it for x.

Answer 8

I don't understand this question at all

Answer 9

hmmm
x+3y=-28
y=-5x

is that the original system of equations?

Answer 10

Also, it looks like you subbed wrong...

\(x+3y=-28 \)
\(y=-5x\)

Means:
\(x+3(-5x)=-28 \)

Answer 11

Solve that for x. Once you have a number, put that number into either equation in place of x and then you can solve for y.

Answer 12

OK That makes somewhat more sense
That would give me
x-15x=-28

Answer 13

Wait is that right?

Answer 14

Yes. But it is not complete. What is x-15x?

Answer 15

Um...This is easy i should know this

Answer 16

x=1 right?

Answer 17

No.

Think aout this for a moment: 1-15=?

Answer 18

If it is then it's
-14x

Answer 19

x means 1x, which is probably what you meant.

Answer 20

Right that's what I meant :)

Answer 21

So we are to:
-14x=-28

Next step?

Answer 22

x-15x=-28
so -14x=-28
-28/-14
x=2

Answer 23

Then I plug in 2 into y=-5x
y=-5(2)
y=-10

Answer 24

YES! Now sub in the 2 for x in one of the originals...

Yah, like that. That is it.

Answer 25

Thanks @e.mccormick :D

Answer 26

np. have fun!