Question

How can I solve this in substitution, can I have a step by step. (x,y)
y=2x+1
2x-y=3

Answer 1

First, you have to see if there is y= or x = to substitute for the equation to find the solution.

y = 2x + 1

Rewrite the equation in slope-intercept form.

2x - y = 3 -> y = 2x + 3

Add both equations together. Substitute.

2x+1 2(1)+1 = y

+ 2x+3 2 + 1 = y

y = 3

y= 4x + 4

4x =4

x = 1

Your answer should be (1,3).