Nikki1300: Solve by using substitution,and check your answers.
3x+y=5z
2x-y=10
I tried this a few times and I kept getting the wrong answer even though I was doing the work right,someone please help!
I don't think that you really intended the z to be there, did you? I'll ignore the z and say that it is just 5.
anyway to start i'd add them
3x+2x+y-y=5+10
5x=15
x=3
Sub x=3 into either of the original equations (I'll use the second one)
2x-y=10
2*3-y=10
6-y=10
6-10=y
y=-4
therefore x=3 and y=-4
double check by substituting both numbers into the 1st equ 3x+y=5
3*3+-4 = 9-4 = 5 great, it's correct
+118654 
