Question

Is there a formula for situations like this?

Answer 1

@raffle_snaffle

Answer 2

@zepdrix

Answer 3

@Jadeishere

Answer 4

@ShadowLegendX

Answer 5

Does it ask you to use a specific method?

Answer 6

No it does not.

Answer 7

Do you have an idea on how to start with this problem?

Answer 8

No I have no idea on how to start this problem.

Answer 9

Ok, well there are there are two methods. Elimination and Substitution.

Answer 10

\[x + 2y = 15\]

\[x - 2y = -9\]

Answer 11

Elimination is the easiest one to do here, because of 2y and -2y canceling each other out.

Basically we add these two equations.

\[(x + 2y = 15) + (x -2y = -9)\]

Answer 12

We end up with

\[2x = 6\]

Answer 13

Divide by 2

\[x = 3\]

Answer 14

Now we put 3 in for x, then solve for y

Answer 15

Oh I see. That makes sense.

Answer 16

\[3 + 2y = 15\]

\[2y = 12\]

\[y = 6\]

Answer 17

Now we input both x and y into both equations to check our work

Answer 18

We get x=3 and y=6

Answer 19

\[x + 2y = 15\]

\[3 + 12 = 15\]

Answer 20

\[3 - 12 = 9\]

Answer 21

I gotta go, I hope this helped

Answer 22

YAY! There is another question like this. I am going to solve it can you check it for me and make sure it is correct when you come back?

Answer 23

Thanks a million! :-D