Chapter 3 Linear Systems and Matrices - 3.4 Solve Systems of Linear Equations in Three Variables - 3.4 Exercises - Mixed Review - Page 185: 61

$x=4$ and $y=-9$

$5x+y=11$ $/\times(-3)$ to get rid of the $y$ $2x+3y=-19$ _________________ $-15x-3y=-33$ $2x+3y=-19$ _________________ $-13x=-52$ $x=\frac{52}{13}$ $x=4$ when $x=4$... $2(4)+3y=-19$ $8+3y=-19$ $3y=-27$ $y=-\frac{27}{3}$ $y=-9$