Algebra Practice Test 2025 - Free Algebra Practice Questions and Study Guide

To find the value of \( x \) given the equations \( x + 2y = 10 \) and \( y = 3 \), we first substitute the value of \( y \) into the equation.

By substituting \( y = 3 \) into the equation \( x + 2y = 10 \), we replace \( y \) with \( 3 \), which gives us:

\[

x + 2(3) = 10

\]

This simplifies to:

\[

x + 6 = 10

\]

Next, we isolate \( x \) by subtracting \( 6 \) from both sides:

\[

x = 10 - 6

\]

This leads us to:

\[

x = 4

\]

Thus, the correct answer is that \( x = 4 \). This result is confirmed by substituting back into the original equation to ensure it satisfies \( x + 2y = 10 \), maintaining the integrity of the solution.