Question

x + y = 4
x - 2y = -5
If the first equation is multiplied by 2 and then the equations are added, the result is _____.

Answer 1

x + y = 4
multiplied by 2 gives
2x + 2y = 8
x - 2y = -5
------------------
3x + 0=3

x=1

Answer 2

2(x+y)=2(4)
2x + 2y = 8

2x + 2y =8
+ x - 2y =-5
-------------
3x + 0 = 3


So 3x = 3

Answer 3

Thanks again. Just checking my work