The points , (−15,1) and , (−7,r) lie on a line with slope 5/4. Find the missing coordinate r. Click image to enlarge

The missing coordinate r is 11.

Solution:

Given points are (–15, 1) and (–7, r).

Slope (m) =

To find the missing coordinate r:

Slope formula:

Substitute the given values in the formula.

Do cross multiplication.

40 = 4r – 4

Add 4 on both side of the equation.

44 = 4r

Divide by 4 on both side of the equation.

11 = r

⇒ r = 11

Hence the missing coordinate r is 11.

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c > -10.55

step-by-step explanation: