Write the piecewise function shown in the graph.
Please help I forgot how to do this

That's an absolute value function but here's how you would write it as a piecewise

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