How do you solve #y=x+3# and #y=2x-4# using substitution?
1 Answer
Mar 9, 2016
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
