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Which equation has $x = 3$ as its solution?

Class 7Checking Solutions by TrialSimple Equations

A $5 x + 2 = 13$
B $2 x - 5 = 3$
C $x \div 3 = 3$
D $5 x - 2 = 13$

Step-by-Step Solution

Put

x = 3

in each: 15 − 2 = 13 ✓; 15 + 2 = 17; 6 − 5 = 1; 3 ÷ 3 = 1. Only the first works.

Answer: D)

5 x - 2 = 13

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