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2x + y = -9 ⇒⇒⇒ y = -9 -2x
y = -9 -2x subtitusikan kepersamaan ke 1
-9 -2x = px² + 4x +9
0 = px² + 6x +18
mempunyai 1 penyelesaian artinya D =0
D= b² - 4 ac
0 = 6² - 4. p.18
0=36 - 72p
72p = 36
p = 1/2