若2X-Y=3K-1 3X+4y=11k+3的解满足x+y=4求k

问题描述:

若2X-Y=3K-1 3X+4y=11k+3的解满足x+y=4求k

2X-Y=3K-1 .(1)3X+4y=11k+3.(2)(1)*4+(2):8x+3x = 12k-4+11k+311x=23k-1.(3)(2)*2-(1)*3:8y+3y=22k+6-9k+311y=13k+9.(4)(3)+(4)11(x+y)=23k-1+13k+9=36k+8x+y=411*4=36k+8k=1