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a ) untuk jln datar x = 137/52
untuk jalan tdk datar x = 137/22
b) x = 137/22
x = 6,23 jam
no 2)
doni = x
anton = x+2
doni + anton = 30
x + x+2 = 30
2x = 28
x = 14
umur doni = 14
umur anton = 16
no 3)
panjang = (4x+3)
lebar = ( 2x-2)
a) keliling = 2(p+l)
= 2(4x+3+2x-2)
= 12x + 2
b) 12x + 2 = 62
12x = 60
x = 5
c) panjang = 4x + 3 = 23
lebar = 2x-2 = 8