What is the substitution method for 2x=8 and x+y=2

Question

asked Sep 19, 2019 185k views

1 Answer

Brownish Monster · Answer 1 · 2019-09-24T10:05:50+0000

Answer:

$x=4,\ y=-2$

Explanation:

You can use substitution method in two ways.

1 way: From the first equation
2x=8 you can express x by dividing the whole equation by 2:

x=4

and substitute this x-value into the second equation:

$4+y=2,\\y=2-4,\\y=-2.$

2 way: From the second equation you can express x:

x=2-y

and substitute it into the first one:

$2(2-y)=8,\\4-2y=8,\\-2y=8-4,\\-2y=4,\\2y=-4,\\y=-2.$