GraphSolve the system by substitution.
-X - 2y = 18
2x - y = 0
A) {( -6, -13)}
B) {( -7, -14)}
C) {( 6, 12)}
D) {( -6, -12)}

Question

Quizplus · Accepted Answer

From the second equation, $2x - y = 0$, we can express $y$ in terms of $x$: $y = 2x$. Substituting $y = 2x$ into the first equation, $x - 2(2x) = 18$, simplifies to $x - 4x = 18$, which further simplifies to $-3x = 18$. Solving for $x$, we get $x = -6$. Substituting $x = -6$ back into $y = 2x$, we get $y = 2(-6) = -12$. Therefore, the solution is $(-6, -12)$.

GraphSolve the System by Substitution