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Solve: $3 x + y = 10$ and $2 x - y = 5$ by substitution. Find $x$ .

Class 10Substitution MethodAlgebra — Systems of Equations

A4
B6
C2
D3

Step-by-Step Solution

From the first,

y = 10 - 3 x

. Substitute:

2 x - (10 - 3 x) = 5, 5 x - 10 = 5, 5 x = 15, x = 3

.

Answer: D) 3

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