Question

please help!!!

Solve, using the substitution method.


m + n = 5

m – n = 3









A.

There is no solution.








B.

The solution is (2, –1)








C.

The solution is (4, 1)








D.

There are an infinite number of solutions.

Answer 1

You can use the first equation, m + n = 5 to solve for m, then use that answer and substitute it into the second equation. This is just one of many approaches.

Answer 2

thank you!

Answer 3

Do you understand?

Answer 4

yea kinda

Answer 5

okay, what does m equal?

Answer 6

in the first equation

Answer 7

5?? idk

Answer 8

you just subtract n from both sides to get m by itself.

Answer 9

ok is it like switching it around and then instead of keeping the + u put -?

Answer 10

you need to get m by itself on the left side first, but there is an + n, so you have have to subtract it from both sides:

m + n = 5
-n -n

m = 5 - n

The +n and -n on the right side cancel each other out, so you are left with 5 - n on the right side.

Make sense?

Answer 11

ohh ok I think I get it now

Answer 12

good

Answer 13

I have no idea

Answer 14

i did that wrong

Answer 15

m - n = 3

(5 -n) - n = 3

5 - n - n = 3

5 -2n = 3

-2n = -2

n = 1

now substitute this value back into the first equation

m + 1 = 5

So, what does m equal?