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Ask the master to solve the math problem in junior high school (variant 3) thank you! ! !
Priority inequality

Then draw according to the inequality.

Determine the objective function

Find a point

accomplish

Inequality: 0.6x+0.9y

X and y are integers! ! !

draw

What is the objective function? Profit =0.2x+0.4y (gray parallel line)

Because this is the biggest profit? So take the parallel line above? And must pass through a point in the black area.

Find out what happened. If x and y are integers? Bring a solution. What if it's not? Take the integer points around the points and in the black area, bring them in one by one, and find the maximum value.

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