SOLUTION: i need help with these questions. 1. solve the system of equations 2x + 3y = 40 and -2x + 2y =20. 2. solve the system of equations 2r + 2s =50 and 2r - s = 17. 3. solve the sy

Algebra ->  Graphs -> SOLUTION: i need help with these questions. 1. solve the system of equations 2x + 3y = 40 and -2x + 2y =20. 2. solve the system of equations 2r + 2s =50 and 2r - s = 17. 3. solve the sy      Log On


   



Question 320464: i need help with these questions.
1. solve the system of equations 2x + 3y = 40 and -2x + 2y =20.
2. solve the system of equations 2r + 2s =50 and 2r - s = 17.
3. solve the system of equations 3r - 4s = 0 and 2r + 5s =23.
4. solve the system of equations 3y + 2z = 12 and y - z = 9.
5. a line in the cartesian plane passes through the points (-2, 4) and (2, -1). what are the rise and the run of the line?

Answer by solver91311(24713) About Me  (Show Source):
You can put this solution on YOUR website!

Sorry. Only one question per post.

1.






Add the two equations:







Substitute:







John