5x-6y= -28 ,3x+4y=6求x与y
问题描述:
5x-6y= -28 ,3x+4y=6求x与y
答
5x-6y= -28 (1)
3x+4y=6 (2)
(1)×2+(2)×3
10x-12y+9x+12y=-56+18
19x=-38
x=-2
代入(1)
-10-6y=-28
y=3
x=-2,y=3