exam Maths Puzzle Numerical Ability

I do not have a question from the book. I have a linear inequality of 5x + 10 y <= 100

Could you tell me how to graph this inequality? Thank you.

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exam Other Question

How much pure acid should be mixed with 7 gallons of a 40% acid solution in order to get an 80% acid solution? Find the equation of each line in the form y = mx + b if possible.

The line through the origin that is perpendicular to the line through (-3,0) and (0,-3)