Question

Two Marks Questions
5) If the point (2k-3, k+2) lies on the graph of equation 2x + 3y + 15 = 0, find the value of
6) Without actually calculating the cubes, find the value of (48)cube - (30)cube -18 cube

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Answer 1

Answer:

2x + 3y + 15 = 0

( 2k - 3 , k + 2) lies on the equation

Solve k:

When y = k + 2, x = 2k - 3

2(2k - 3) + 3(k + 2) + 15 = 0

4k - 6 + 3k + 6 + 15 = 0

7k + 15 = 0

7k = -15

k = -15/7

Answer: k = -15/7