3x+5y=4,5x-ky=0 求k

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3x+5y=4,5x-ky=0求k3x+5y=4,5x-ky=0求k3x+5y=4,5x-ky=0求k5x-ky=0=>5x=ky1:若x=y,则k=5则3x+5y=8x=4得x=y=0.5,k=52

3x+5y=4,5x-ky=0 求k
3x+5y=4,5x-ky=0 求k

3x+5y=4,5x-ky=0 求k
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