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A is the point with coordinates (4, 6)
B is the point with coordinates (d, 21)

The gradient of the line AB is three.

Work out the value of d.

A is the point with coordinates 4 6 B is the point with coordinates d 21 The gradient of the line AB is three Work out the value of d class=

Respuesta :

musiclover10045

The gradient is the slope.

Slope is the change in y over the change in x.

3 = (21-6) / (d-4)

Simplify:

3 = 15/(d-4)

(D-4) = 15/3

D-4 = 5

Add 4 to both sides :

D = 9

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