Respuesta :

Apply the slope formula

[tex]m=\frac{y2-y1}{x2-x1}[/tex]

where:

m = slope = 1/2

(x1,y1) = (-15,4)

(x2,y2)= (r,10)

replacing:

[tex]\frac{1}{2}=\frac{10-4}{r-(-15)}[/tex]

Solve for r

Cross multiply:

1 (r+15) = 6 (2)

r+ 15 = 12

r= 12-15

r= -3

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