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Solve: $2 x + y = 11$ and $x + 2 y = 13$ by substitution. Find $x$ .

Class 10Substitution MethodAlgebra — Systems of Equations

A6
B4
C2
D3

Step-by-Step Solution

From the first,

y = 11 - 2 x

. Substitute:

x + 2 (11 - 2 x) = 13, x + 22 - 4 x = 13, - 3 x = - 9, x = 3

.

Answer: D) 3

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