minimize z= 5x + 9y

subject to
6x + y >= 18
2x + 3y >= 30
x<= 12
x,y>= 0

find the corner points, ans subject the objective function to the corner points, finding the minimum value of z giving the constraints.

i know the first and second points but i couldn't figure out the third one and the minimal value. please help me!! :[

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