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y = -3x - 65 m= -3
y = ax² + bx - 2
y' = 2ax + b
y'(-1) = -3 = 2.a.-1+b
-3 = -2a + b .... i
y(-1) = -1 = a(-1)² + b. (-1) -2
-1 = a - b -2
1 = a-b .... ii
Eleminasi i dan ii
maka didapat
-3 = -2a + b
1 = a-b ...... dijumlah
-2 = -a
2 = a disubtitusi ke ii
1 = a-b
1 = 2-b
b = 1
^_^