Use substitution to solve each system of equations. Step by Step plz 4.) y=3x+8
2y=6x+16
5.) y=4x+5
12x-3y=9
6.) 7y=-2x+5
3x+10y=6

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

It took alice 5 5/6 hours to drive to her grandparents' house for . on the way home, she ran into traffic and it took her 7 3/8 hours. how much longer did the return trip take? write your answer as a proper fraction or mixed number in simplest form. the trip home took __hours longer. ?

Through non-collinear points there is exactly one plane.