Numerical: Write the equation of the line through the points( 1, – 1) and( 3, 5).
Solution: Here x1 = 1, y1 = – 1, x2 = 3 and y2 = 5. Using two-point form formula
We get, y-(-1) =( 5 –(-1))/( 3-1) *( x- 1) or −3x + y + 4 = 0
Slope Intercept form
If slope & intercept on y axis is known for a line, we can form equation of the line.
Equation of line will be: y = mx + c