Chapter 10 - Radical Expressions and Equations - Common Core Cumulative Standards Review - Selected Response - Page 659: 13

Answer A

$x+2y=23$ $4x-y=-7$ Multiply both sides of the second equation with $2$. $8x-2y=-14$ Using elimination: $x+2y=23$ $8x-2y=-14$ ___________________ $9x=9$ $x=1+2y=23$ Solve for y: $4(1)-y=-7 \rightarrow y=11$ The correct answer is A.