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= 8x-7x-5y-9y
= x-14y
2.f(x)=-4x-2
x=1
Nilai fungsi = -4x-2
= -4.1-2
= -4-2= -6
3.Panjang lintasan= Keliling lingkaran . banyak berputar
= 22/7.2.1,4.2000
= 22.2.2.200= 44.400= 17.600 cm= 176 m
4.Rumus jari jari lingkaran luar segitiga= a.b.c / 4.L
= 3.4.5 /4.1/2.3.4
= 60/24
= 2,5 cm