Question

Solving by addition
x+y=4
2x+y=5

Answer 1

multiply the first equation by -1.
so you can easily eliminate y in the first equation

Answer 2

thats what i did wrong, i multiplied by -2

Answer 3

multiply by positive two. y=3.

Answer 4

y=3 and X= 1

Answer 5

is is not wrong, multiplying by -2 is also a possibility

Answer 6

you did that right as well, it depends upon you how u r going to solve.

Answer 7

thank you i got it

Answer 8

Exactly, this math, there are many possibilities, I'm stating the easiest in my opinion.