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Solve: $x - y = 4$ and $2 x + y = 14$ by substitution. Find $x$ .

Class 10Substitution MethodAlgebra — Systems of Equations

A6
B12
C7
D5

Step-by-Step Solution

From the first,

x = y + 4

. Substitute:

2 (y + 4) + y = 14, 3 y + 8 = 14, 3 y = 6, y = 2, x = 6

.

Answer: A) 6

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