Question

x+y=-6/5 và  x/y=3 thì 10x=

Answer 1

x/y=3

=> x=3y

x+y=-6/5

=> 3y+y=-6/5

=> 4y=-6/5

=> y=-3/10

=> x=3y=3.(-3/10)=-9/10

=> 10x=10.(-9/10)=-9

Answer 2

Ta có: x+y=-6/5

Thay x=3y, ta được:

3y+y=\(-\frac{6}{5}\)

\(\Rightarrow4y=\frac{-6}{5}\)

\(y=\frac{-3}{10}\)

\(\Rightarrow x=\frac{-6}{5}-\frac{-3}{10}\)

\(\Rightarrow x=\frac{-9}{10}\)

\(\Rightarrow10x=\frac{-9}{10}.10=-9\)