Answer :

Answer:

a) 7

Step-by-step explanation:

slope = difference of y / difference of x

-5/3 = (2 - r) / (r - 4)

3 x (2 - r) = (-5) x (r - 4)

6 - 3r = -5r + 20

-3r + 5r = 20 - 6

2r = 14

r = 7

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