Question

If m= -4 and n=7, what is the value of m- n?

3
-3
11
-11

Answer 1

m + n = 7 then m = 7 - n
2n - 3m = 6

substitute m = 7 - n into 2n - 3m = 6
2n - 3m = 6
2n - 3(7 - n) = 6
2n - 21 + 3n = 6
5n - 21 = 6
5n = 27
n = 27/5
n = 5.4

m + n = 7
m = 7 - n
m = 7 - 5.4
m = 1.6

now you have m = 1.6 and n = 5.4
you can find the value of 3n - 2m

3n - 2m
=3(5.4) - 2(1.6)
= 16.2 - 3.2
= 13

Answer 2

Answer:

m + n = 7 then m = 7 - n

2n - 3m = 6

substitute m = 7 - n into 2n - 3m = 6

2n - 3m = 6

2n - 3(7 - n) = 6

2n - 21 + 3n = 6

5n - 21 = 6

5n = 27

n = 27/5

n = 5.4

m + n = 7

m = 7 - n

m = 7 - 5.4

m = 1.6

now you have m = 1.6 and n = 5.4

you can find the value of 3n - 2m

3n - 2m

=3(5.4) - 2(1.6)

= 16.2 - 3.2

= 13

Step-by-step explanation: already there