What is the slope of the line passing through (1, 2) and (3, 8) ?

slope = 1/7

slope = 1/3

slope = 3

slope = 7

Slope=3

Assume the slope is k, the y-intercept is b

U can get to equation according to (1,2) and (3,8):

2=1k+b

8=3k+b

Subtract equation 1 by equation 2, u can get 2k=6;

So k=3;

Therefore the slope is equal to 3