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.Com
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) (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
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