SOLUTION: If (5x^2)+6x=70 and (5x^2)-6y=10,then what is the value of 10x+10y? A.10 B.20 C.60 D.80 E.100

Algebra ->  Exponents -> SOLUTION: If (5x^2)+6x=70 and (5x^2)-6y=10,then what is the value of 10x+10y? A.10 B.20 C.60 D.80 E.100      Log On


   

Question 640390: If (5x^2)+6x=70 and (5x^2)-6y=10,then what is the value of 10x+10y?
A.10
B.20
C.60
D.80
E.100
Answer by sachi(548) About Me  (Show Source):
You can put this solution on YOUR website!
(5x^2)+6x=70 ----1
(5x^2)-6y=10 ----2
subtracting 2 from 1
6x+6y=70-10=60
or x+y=60/6=10
or 10x+10y=10*10=100 (E)
ans