Question

Tìm x,y biết:

1, 2x+3y=1800

2, \(\dfrac{x}{y}\)=\(\dfrac{7}{3}\)

Answer 1

1,2x+3y=1800

=>x=\(\dfrac{1800-3y}{2}\)

vậy \(y\in R,x=\dfrac{1800-3y}{2}\)

2,\(\dfrac{x}{y}=\dfrac{7}{3}\)

=>x=\(\dfrac{7y}{3}\)

Vậy...

 

 

Answer 2

2: Ta có: \(\dfrac{x}{y}=\dfrac{7}{3}\)

nên \(x=\dfrac{7}{3}y\)

Vậy: \(\left\{{}\begin{matrix}y\in R\\x=\dfrac{7}{3}y\end{matrix}\right.\)