Given:

Slope = 3

Coordinate (1, 3) is on the line.

Solution:

y = mx + b

Substitute given slope and coordinate and

solve for b;

slope, m = 3

Coordinate (1, 3)

x =1

y = 3

3 = 3(1) + b

b = 0Why they got b=0 and not not 1 for b

Substitute into general

form;

y = 3x + 0

y = 3x