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No.1x + y = 4 → y = 4 - x
y = -x² + 2x + 4
y = y
4 - x = -x² + 2x + 4
x² - 3x = 0
x(x - 3) = 0
x = 0 x = 3
utk x = 0
y = 4 - x
y = 4 - 0
y = 4
utk x = 3
y = 4 - x
y = 4 - 3
y = 1
jadi titik potongnya = (0,4) dan (3,1)
No.3
x² + y² ≤ 16 adalah lingkaran pusat (0,0) dan r = 4
(DHP nya di dalam lingkaran)
y ≥ 4 - x² adalh parabola terbuka kebawah,
(2 - x)(2 + x) = 0
x = 2 x = -2
memotong sumbu x di (-2,0) dan (2,0)
memotong sumbu y di (0,4)
liat gambar.