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For $5 x + 2 y = 19$ and $x - y = 1$ , find $y$ by substitution.

Class 10Substitution MethodAlgebra — Systems of Equations

A2
B1
C3
D0

Step-by-Step Solution

From

x - y = 1, x = y + 1

. Substitute into

5 x + 2 y = 19 : 5 (y + 1) + 2 y = 19, 7 y + 5 = 19, 7 y = 14, y = 2

(then

x = 3

).

Answer: A) 2

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