Equations of straight lines
When working with straight lines, there are often many ways to arrive at an equation. Let's see:
and...
Find the equation of the line that goes through two points P(x _{1},x_{2}) and Q(y_{1},y_{2})
Firts find the slope using
and then use the formula:
Write the slope-intercept form of the equation of the line with the slope 2 that contains the point (-4,-5).
Use the slope-intercept form to find b:
y=mx+b
-5=2·(-4)+b
8-5=b
3=b
Then y=2x+3