SOLUTION: Solve the system by graphing, addition and substitution methods. –4x + 7y = –10 x – 5y = 9

Algebra ->  Graphs -> SOLUTION: Solve the system by graphing, addition and substitution methods. –4x + 7y = –10 x – 5y = 9      Log On


   

Question 55216: Solve the system by graphing, addition and substitution methods.
–4x + 7y = –10
x – 5y = 9
Answer by venugopalramana(3286) About Me  (Show Source):
You can put this solution on YOUR website!
Solve the system by graphing, addition and substitution methods.
–4x + 7y = –10 ...............1
x – 5y = 9................2
x=9+5y
putting in eqn.1
-4(9+5y)+7y=-10
-36-20y+7y=-10
-13y=-10+36=26
y= -26/13 =-2
x=9+5*(-2)=9-10=-1
x=............0...................1.....................2....etc
y=(x-9)/5....-1.8................-1.6..................-1.4.. etc
Y=(4X-10)/7..-10/7................-6/7.................-2/7...ETC
+graph%28+500%2C+500%2C+-10%2C+10%2C+-10%2C+10%2C%28x-9%29%2F5%2C+%284%2Ax-10%29%2F7%29+
the 2 graphs intersect at x=-1 and y=-2