Which of these equations have 3 as a solution?

5 x - 3 = 3 x - 1

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4 x + 3 = 11

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2 x + 2 = 3 x - 1

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x + 1 = 2

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Solution

The correct option is C $2 x + 2 = 3 x - 1$
Instead of solving all equations individually, plug 3 into each equation one by one.
Substituting in A,
$L H S = 5 \times 3 - 3 = 12$ ; $R H S = 3 \times 3 - 1 = 8$
Substituting in B,
$L H S = 4 \times 3 + 3 = 15$ ; $R H S = 11$
Substituting in C,
$L H S = 2 \times 3 + 2 = 8$ ; $R H S = 3 \times 3 - 1 = 8$
LHS = RHS; Therefore, 3 is a solution of this equation.
Hence, C is the answer.

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