SOLUTION: I have tried this but I am having trouble, can you please help. Use substitution to solve each system. If it does not have one solution then put no solution or indinitely many so

Algebra ->  Expressions-with-variables -> SOLUTION: I have tried this but I am having trouble, can you please help. Use substitution to solve each system. If it does not have one solution then put no solution or indinitely many so      Log On


   

Question 181875: I have tried this but I am having trouble, can you please help. Use substitution to solve each system. If it does not have one solution then put no solution or indinitely many solutions. 1/3X-Y=3 2X+Y=25
Answer by checkley77(12844) About Me  (Show Source):
You can put this solution on YOUR website!
1/3X-Y=3
-y=-x/3+3
y=x/3-3 now replace y with (x/3-3) in the other equation
2X+Y=25 SORY I MISSED THE 2 IN FRONT O THE X.
2x+(x/3-3)=25
2x+x/3=25+3
2x+x/3=28
(2x*3+x)/3=28
(6x+x)/3=28
7x=3*28
7x=84
x=84/7
x=12 ans.
y=12/3-3
y=4-3
y=1 ans.
Proof:
2*12+1=25
24+1=25
25=25