SOLUTION: solve by substitution: 4x-5y=-11 x+2y=7

Algebra ->  Graphs -> SOLUTION: solve by substitution: 4x-5y=-11 x+2y=7       Log On


   

Question 1075912: solve by substitution:
4x-5y=-11
x+2y=7
Answer by MathLover1(20850) About Me  (Show Source):
You can put this solution on YOUR website!

4x-5y=-11....eq.1
x%2B2y=7.......eq.2
------------------
x%2B2y=7.......eq.2......solve for x
x=7-2y.........substitute in eq.1
4x-5y=-11....eq.1
4%287-2y%29-5y=-11.....solve for y
28-8y-5y=-11
28-13y=-11
28%2B11=13y
39=13y
39%2F13=y
3=y
go to x=7-2y, substitute 3 for y and solve for x
x=7-2%2A3
x=7-6
x=1
solutions: x=1 and y=3