Lines from point/slope

Question

What is the equation of the line that passes through the point(1,2) and has a slope of 2

Answer 1

line through (1,2) with slope of 2

is

y =2x +b where b=y intercept. Plug in x=1, y=2 to solve for b

2 =2+b, b= 0, y intercept is the origin (0,0)

y=2x is the line's equation, which has slope =2 and goes through (1,2)