Help solving problem

Question

Find the equation of the line containing P1 (1,3) and P2 (2,4)

Answer 1

slope = m = (4-3)/(2-1) = 1/1 = 1

y=mx+ b where m = 1 and b = the y intercept

plug in either point to solve for b

3=1(1) + b

b =2

y= x + 2