Question

One equation of a pair of dependent equations is −5x + 2y = 4. The second equation can be

(a) $10x+4y+8=0$
(b) $-10x-4y+8=0$
(c) $-10x+4y=8$
(d) $10x-4y=8$

Answer 1

The correct option is (c).

One of the two dependent equations:
−5x + 2y = 4
Thus, by observation, the right option is as follows:
−10x + 4y = 8
⇒ 2(−5x + 2y = 4)