Question

Solve by substitution:
3m-2n=-12
m-4n=8

Answer 1

HI!!

Answer 2

please solve the second equation for m first

Answer 3

really want to do it by substitution this time?

Answer 4

yes i do

Answer 5

the second equation
\[m-4n=8\] is the same as
\[m=4n+8\]

Answer 6

substitute the \(m\) in the first equation by \(4n+8\)
use parentheses

Answer 7

3(4n+8)-2n=-12

Answer 8

yes

Answer 9

then solve that for \(n\)

Answer 10

12n+24-2n=-12

Answer 11

keep going

Answer 12

10n=-12-24

Answer 13

10n=-36
divide both sides by 10
n=-3.6

Answer 14

looks good to me

Answer 15

m-4(-3.6)=8
m+14.4=8
m=8-14.4
m=-6.4

Answer 16

hold on

Answer 17

oh it is right good work!

Answer 18

I think I'm starting to get the gist of this now!
thank you

Answer 19

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