Question

solveby substitution method
3m+n=13
m-5n=47

Answer 1

From the second equation,
m = 5n + 47

Substitute that into the first one to get
3(5n + 47) + n = 13

Distribute to get
15n + 141 + n = 13

Combine like terms to get
16n +141 = 13

Subtract 141 from both sides to get
16n = -128

Divide by 16 to get
n = -8

Then plug -8 into either equation for n and solve for m.

Answer 2

That is not correct it is suppose to have two not just one

Answer 3

I was leaving that part to you, but I'll show you that one too.

It would be easier to plug n into the second equation like so:
m - 5(-8) = 47

Simplify to get
m + 40 = 47

Subtract 40 from both sides to get
m = 7