How do you find the value of r such the points (7,-10), (r,4) with slope m=-3?

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Answer 1 · 2017-02-11T06:46:13

#r=7/3#

You could apply the formula:

#m=(Deltay)/(Deltax)=(y_2-y_1)/(x_2-x_1#

and solve the equation:

#(4+10)/(r-7)=-3#

Then it is:

#-3r+21=14#

#3r=21-14#

#r=7/3#