x=-10+2y
7x-9y=7
7(-10+2y)-9y=7
y=77/5
x=-10+2*77/5
x=104/5
Ответ: x=20,8; y=15,4
-------------------------------------------------------
(104/5)2=208/10=>20,8
(77/5)2=154/10=>15,4
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Answers & Comments
7(-10+2у)-9у=7 -70+14у-9у=7 5у=77
Х=-10+2*15,4 Х=20,8
У=15,4 У=15,4
Ответ:(20,8;15,4)
x=-10+2y
7x-9y=7
7(-10+2y)-9y=7
y=77/5
x=-10+2*77/5
x=104/5
Ответ: x=20,8; y=15,4
-------------------------------------------------------
(104/5)2=208/10=>20,8
(77/5)2=154/10=>15,4