Question

x + 2y = 10

3x + 4y = 8
.Which point is the solution to the system of equations?

Answer 1

multiply by 2 the 1st equation then subtract with the 2nd equ

Answer 2

2x + 4y = 20
3x + 4y = 8
-------------- (-)
-x = 12
x = -12

Answer 3

subtitute x=-12 to one of equations above :
x + 2y = 10
-12 + 2y = 10
2y = 10 + 12
2y = 22
y = 22/2 = 11

so, as the solution is {-12,11}