Find y if the line through (1,y) and (3,5) has slope of 2. Y=?

Question

How to solve the question?

 

y=

Answer 1

Let's look at our rise over run formula which is

 

y₂ - y₁ / x₂ - x₁  

 

2 = 5 - y / (3 - 1)

 

4 = 5 - y

 

y = 1

 

So the line with slope 2 passes through the points (1,1) and (3,5).