Question

已知丨3x+y-5丨+丨x-2y-4丨=0 求x,y的值

Answer 1

丨3x+y-5丨+丨x-2y-4丨=0

3x+y-5=0 1

x-2y-4=0 2

1式*2 6x+2y-10=0 3

3式+2式 7x-14=0

x=2

y=5-3*2=-1

x=2 y=-1