Question

3x+5y=4,5x-ky=0 求k

Answer 1

5x-ky=0 => 5x=ky

1：若 x = y ,则 k = 5

则 3x + 5y = 8x = 4

得 x = y = 0.5,k = 5

2：若 x = k,则 y = 5

则 3x + 25 = 4

得 x = k = -7,y = 5