Slope of a line problem

Geometry Level 1

Given points M ( 2 , 7 ) M(-2, 7) and K ( 4 , y ) K(4, y) in a coordinate plane, for what value of y y is the slope of the line through M M and K K equal to 3 2 \dfrac{-3}{2} .


The answer is -2.

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1 solution

Hana Wehbi
Oct 16, 2020

Given points M ( 2 , 7 ) M(-2,7) and K ( 4 , y ) K(4,y) in a coordinate plane, for what value of y y if the slope of the line passing through M and k is 3 2 \frac{-3}{2}

From the definition of the slope we have:

y 7 4 ( 2 ) = 3 2 y 7 6 = 3 2 \frac{y-7}{4-(-2)}=\frac{-3}{2}\implies \frac{y-7}{6}=\frac{-3}{2}

y 7 = 9 y = 2 \implies y-7=-9\implies y=-2


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