Question

Daca x (supra) y =3 (supra) 4
caluculati a) x (supra) x+y
b)3x - y (supra) 2x

Answer 1

[tex]\dfrac{x}{y}=\dfrac{3}{4}\Rightarrow\dfrac{x}{3}=\dfrac{y}{4}=k\Rightarrow x=3k,y=4k\\ a)\dfrac{x}{x+y}=\dfrac{3k}{3k+4k}=\dfrac{3\not k}{7\not k}=\dfrac{3}{7}\\ b)\dfrac{3x-y}{2x}=\dfrac{9k-4k}{6k}=\dfrac{5 \not k}{6\not k}=\dfrac{5}{6}[/tex]

Answer 2

x/y =3/4. =>x=3 ,y=4
a) x/x+y =3/3+4 =3/7
b). 3x-y/2x =3•3-4/2•3 =>9-4/6 =>5/6