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
x-2y=-5

2(x+y=4)
2x+2y=8
+(x-2y=-5)
3x+0=3
3x=3
x=1