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3(4 + 6r) = -28

r = -20/9

Step-by-step explanation:

Step 1: Write out equation

3(4 + 6r) = -28

Step 2: Distribute 3

12 + 18r = -28

Step 3: Subtract 12 on both sides

18r = -40

Step 4: Divide both sides by 18

r = -20/9

answer: evaluate the objective function at each vertex to determine which - and -values, if any, maximize or minimize the function. example: find the minimum value and maximum value of the objective function f ( x , y ) = 4 x + 5 y , subject to the following constraints