Question

Tìm x,y

x+1/y=3/5 và x-y=9

x-4/x-3=4/3 và x-y=5

Answer 1

\(\frac{x+1}{y}=\frac{3}{5}\)

=> 5(x + 1) = 3y

=> 5x + 5 = 3y

=> 5x - 3y = 5

=> (3x - 3y) + 2x = 5

=> 3(x - y) + 2x = 5

=> 3.9 + 2x = 5

=> 2x = 5 - 27

=> 2x = -22

=> x = -22:2

=> x = -11

Answer 2

\(\frac{x-4}{x-3}=\frac{4}{3}\)

=> 3(x - 4) = 4(x - 3)

=> 3x - 12 = 4x - 12

=> -12 + 12 = 4x - 3x

=> 0 = x