1. Slope-intercept Form of Equations of Straight Lines

2. How can we find the equation of L?
Suppose we are given the slope and the y-intercept of a straight line L.
How can we find the equation of L?
By the point-slope form, we have
y - c = m(x - 0)
 L passes through (0, c).
y - c = mx
y = mx + c

3. Slope-intercept Form
The equation of L with slope m and y-intercept c is given by :
y = mx + c

4. Follow-up question
Find the equation of the straight line with y-intercept –2 and slope 3.
The equation of the straight line is
y = 3x + (-2)
 y = 3x - 2
 y = mx + c