Ask your own question, for FREE!
Mathematics
OpenStudy (anonymous):

Solve the system by substitution: 2x-y=5 -2x+y=7

8 years ago
OpenStudy (anonymous):

Solve one of the equations for y, then place that answer into the other equation and solve for x, then take that answer and put it back into the first equation. y=2x+7 2x-(2x+7)=5 ......this looks wrong, give me a second..

8 years ago
OpenStudy (anonymous):

I'm either not doing the math correct or those equations are wrong, it keeps telling me that there is no x.....

8 years ago
OpenStudy (anonymous):

Oh. Well those are the right equations.

8 years ago
OpenStudy (cruffo):

when you get an answer like -7 = 5 which is not true, that just means there is no solution. The lines are parallel (same slope, different y-intercept).

8 years ago
Can't find your answer? Make a FREE account and ask your own question, OR you can help others and earn volunteer hours!