Find the equation for the line passes through (1,3) and (2,-1)

Expert Answers

An illustration of the letter 'A' in a speech bubbles

The line passes through A(1,3) and B(2,-1)

Then:

y-yA = m (x-xA)     where m is the slope.

m= (yB-yA)/(xB-xA) = (-1-3)/(2-1) = -4

Then:

y-3 = -4(x-1)

y-3 = -4x + 4

==> y= -4x +7

Approved by eNotes Editorial Team