Question

How do you solve `y=x+3` and `y=2x-4` using substitution?

Answer 1

x = 7 , y = 10

Explanation:

The 2 equations are both given in terms of x , hence can be equated directly.

thus : 2x - 4 = x + 3

collect x terms to left and numbers to right

`rArr x = 3+4 = 7`

now substitute x = 7 into y = x + 3 ( or y = 2x - 4 )

hence y = 7 + 3 = 10