Question

tim x,y

5x-3y=0 va x+y-16=0

 

Answer 1

5x-3y=0(1)

x+y-16=0=>x+y=16

=>x=16-y (2)

thay x=16-y vào (1)

Ta có: 5(16-y)-3y=0

=> 80-5y-3y=0

=> -8y=-80

=>y=10
Thay y=10 vào (2) tìm được x=6

Vậy x=6;y=10

Answer 2

Ta có:5x-3y=0

\(\Rightarrow5x=3y\Rightarrow x=\frac{3}{5}y\)

Ta có:x+y-16=0

\(\Rightarrow x+y=16\)

Hay \(\frac{3}{5}y+y=16\)

\(y\cdot\frac{8}{5}=16\)

\(y=16:\frac{8}{5}\)

\(y=10\Rightarrow x=\frac{3}{5}\cdot10=6\)