5. the first equation gives you the value of y. So plug in the value of y into the second equation: 3x+2(-x-7)=3. Simplify: 3x-2x-14=3. Subtract: 1x-14=3. Add 14 to both sides: x=17. Now you know the x value. You plug in the x value into the first equation: y=-17-7 Solve: y=-24 Answer: 17, -24