X plus y equals 7 and x plus 2y equals 11?

Answer 1

x=3 and y=4.

you multiply x+y=7 by neg. 2

this way you can cancel out the y factors

and get neg. 2x+x=-14+11

neg. x = neg. 3

divide both sides by neg. 1

to get x=3.

use substitution to get y=4