SAT Systems of two linear equations in two variables Practice Question 2 (Easy)

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Question bank / Systems of two linear equations in two variables

Math · AlgebraEasy

$y = 3x$
$2x + y = 25$
If $(x, y)$ is the solution to the system of equations, what is the value of $y$ ?

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Answer: 15

Substitute $3x$ for $y$ in the second equation: $2x + 3x = 25$ , so $5x = 25$ and $x = 5$ . Then $y = 3(5) = 15$ .

Stopping at $x = 5$ gives the value of $x$ , not $y$ .

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