Plz me ***will mark brainliest***

For question one.

Substitute numbers for variable

7=m*5+10

fip equation

5m +10=7

now solve for m

subtract 10 from both sides

5m=-3

divide both sides by 5

you end up with a fraction

Answer -3/5

Question 2

perimeter of a rectangle is p=2L+2W

L=length W=width

They are telling you that L=12 and W=5

substitute numbers for variables

p=2*12+2*5

Answer 35

5x-3x+6y+3x-4y=5x+2y. First, you need to count it, then draw x line and y line, that’s done!

Step-by-step explanation: