Question

方程组3X+3Y+2X-2Y=36 4X+4Y-5X+5Y=2 怎么化简啊！！

紧急！快！！！！1

Answer 1

化简成：45x+9y=324
-x+9y=2
两式相减：x=7
y=1

Answer 2

3X+3Y+2X-2Y=36
(3X+2X)+(3Y-2Y)=36
5X+Y=36 (1)

4X+4Y-5X+5Y=2
(4X-5X)+(4Y+5Y)=2
-X+9Y=2 (2)

(1)+(2)*5
5X+Y-5X+45Y=36+10
46Y=46
Y=1
X=9Y-2=7

Answer 3

5x+y=36
9y-x=2