1.

The equation having – 2 as solution is (a) x + 2 = 5 (b) 7 + 3x = 1 (c) 2x + 3 = 7 (d) 2(x + 1) = 4

Answer»

Correct option is: (b) 7 + 3x = 1

(a) x + 2 = 5 

⇒ x + 2 – 2 = 5 – 2 (Subtract 2 on both sides) 

⇒ x = 3 it is not – 2

(b) 7 + 3x = 1 

⇒ 7 + 3x – 7 = 1 – 7 (Subtract 7. on both sides)

⇒ 3x = – 6

⇒ 3x/3 = -6/3 (Divide by 3 on both sides)

∴ x = – 2 

so, solution is – 2 

Similarly, check (c) and (d) also.



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