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Question

Find the value of y if the line through the two given points is to have the indicated slope.

(3,y) and (1,4),m=3( 3 , y ) \text { and } ( 1,4 ) , m = - 3

Solution

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The slope of a line passing through points (x1,y1)(x_1,y_1) and (x2,y2)(x_2,y_2) is given by:

m=y2y1x2x1(1)\color{#4257b2}m=\dfrac{y_2-y_1}{x_2-x_1}\color{white}\tag{1}

Let (x1,y1)=(3,y)(x_1,y_1)=(3,y) and (x2,y2)=(1,4)(x_2,y_2)=(1,4) the substitute m=3m=-3:

3=4y13-3=\dfrac{4-y}{1-3}

3=4y2-3=\dfrac{4-y}{-2}

Multiply both sides by 2-2:

6=4y6=4-y

Subtract 4 from both sides:

2=y2=-y

Divide both sides by 1-1:

2=y-2=y

or

y=2\color{#c34632}y=-2

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