Question

{10x+y=7
10x+y-27=10y+x

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Answer 1

10x+y=7
10x+y-27=10y+x
10x+y=7
10x+y-10y-x=27
10x+y=7/*(-9)
9x-9y=27/*10
-90x-9y=-63
90x-90y=270
-90x-9y+90x-90y=-63+270
-99y=207/:(-99)
y=2,(09)

10x+y=7
10x+2,(09)=7
10x=4,(09)/:10
x=0,(49)


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