SOLUTION: Please help!!!! Solve by the addition method. 4x-5y=22 and x+2y=-1

Algebra ->  Customizable Word Problem Solvers  -> Misc -> SOLUTION: Please help!!!! Solve by the addition method. 4x-5y=22 and x+2y=-1      Log On

Ad: Over 600 Algebra Word Problems at edhelper.com


    

Question 930687: Please help!!!!
Solve by the addition method.
4x-5y=22 and x+2y=-1
Answer by MathLover1(20849) About Me  (Show Source):
You can put this solution on YOUR website!

4x-5y=22......eq.1
x%2B2y=-1.......eq.2...multiply by -4
________________
4x-5y=22......eq.1
-4x-8y=4.......eq.2
_________________________add eq.1 and eq.2
4x-5y%2B%28-4x-8y%29=22%2B4
4x-5y-4x-8y=26
cross%284x%29-5y-cross%284x%29-8y=26
-5y-8y=26...solve for y
-13y=26
y=26%2F-13
highlight%28y=-2%29
go to eq.2, substitute -2 for y
x%2B2%28-2%29=-1.......eq.2
x-4=-1...solve for x
x=4-1
highlight%28x=3%29
solution is: (3,-2)


+graph%28+600%2C+600%2C+-10%2C+10%2C+-10%2C+10%2C+4x%2F5-22%2F5%2C-x%2F2-1%2F2%29+