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Does anyone know the answer?

Does anyone know the answer?-example-1
User Lemunk
by
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1 Answer

5 votes

Answer:

d = 9

Explanation:

Calculate the slope m using the slope formula and equate to 3

m =
(y_(2)-y_(1) )/(x_(2)-x_(1) )

with (x₁, y₁ ) = (4, 6) and (x₂, y₂ ) = (d, 21)

m =
(21-6)/(d-4) , that is


(15)/(d-4) = 3 ← multiply both sides by d - 4

15 = 3(d - 4)

15 = 3d - 12 ( add 12 to both sides )

27 = 3d ( divide both sides by 3 )

9 = d , that is

d = 9

User William Carter
by
7.7k points