How do yo solve this difficult problem of Equations?

If you have this equation

Find "x+y"enter image source here

1 Answer
Aug 12, 2018

x+y=6

Explanation:

2x+y=9to(1)

3x-2y=3to(2)

"multiply equation "(1)" by 2"

4x+2y=18to(3)

"add "(2)" and "(3)" term by term"

(3x+4x)+(-2y+2y)=(3+18)

7x=21

"divide both sides by 7"

x=21/7=3

"substitute "x=3" into equation "(1)

6+y=9rArry=9-6=3

"solution is "(x,y)to(3,3)

"hence "x+y=3+3=6