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**For what values of a and b is the line 4x + y = b tangent to the parabola y = ax2 when x = 3?**

**4x + y = b**

y = ax2

y = ax2

**Tried making 4x + y = b to y = b - 12 and making that equal y = 9a then making and setting one of those values to 0. But that was winging it with no prior knowledge. Can someone help me please?**