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b-drugi bok prostokąta
2a+2b=16
a/b=7/9
2a+2b=16
9a=7b
2a=16-2b /:2
9a=7b
a=8-b
9(8-b)=7b
a=8-b
72-9b=7b
a=8-b
-9b-7b=-72
a=8-b
-16b=-72 /:(-16)
a=8-b
b=4,5
a=3,5
b=4,5
b-drugi bok
2a + 2b = 16
7a = 9b
2a= 16 -2b
7a = 9b
a=8-b
7a = 9b
a=8-b
7 * (8-b) = 9b
a=8-b
56 - 7b =9b
a=8-b
-16b = -56 | -16
a= 8-b
b=3,5
a=4,5
b=3,5