Question

ma ajutati va rog si la asta doar calculati cat este

Answer 1

2x+5y
-----------= 4.5; a) x/y=?; b)5x/2y=?; c)(x²+y²)/y²=?
x+y

2x+5y
----------= 45/10; 
x+y

a)
10*(2x+5y)= 45x+45y;   
20x+50y=45x+45y; 
5y=25x
y=5x
x/y=1/5

b)
5x/2y=y/2y=1/2

c)
(x²+y²)y²= x²+25x²/25x²=26x²/25x²= 26/25