a) 5 ( 9+7x) +3x =7
x = - 1
y= 9 + 7x(-1)
(x,y) = (-1,2)
б) 8 - y + 7 y = 2
y = - 1
x = 8 - ( - 1)
( x,y) = ( 9, -1)
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Answers & Comments
a) 5 ( 9+7x) +3x =7
x = - 1
y= 9 + 7x(-1)
(x,y) = (-1,2)
б) 8 - y + 7 y = 2
y = - 1
x = 8 - ( - 1)
( x,y) = ( 9, -1)