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titik potong pada sumbu x -----> y = 0
4x + 3.(0) - 12 = 0
4x = 12
x = 3 ---> titik potong (3 , 0)
lingkaran : dengan pusat (0,0) dan melalui (3 , 0)
x² + y² = r²
3² + 0² = r²
9 = r²
jadi persamaan lingkaran L : x² + y² = 9