Question

Which of the following equations could be the result of using the comparison method to solve the system shown?

x + 2y = 6
x - 4y = 8


2y - 6 = 4y + 8
6 - 2y = -4y + 8
6 - 2y = 4y + 8

Answer 1

x+2y=6
=>x=6-2y
so now if we replace the value of x in another equation we get
6-2y-4y=8
=>6-2y=4y+8