exam Maths Puzzle Numerical Ability

Please show me the graph and the answer to this equation I get confuse with the setting up here is my situation 10y+15x=20 my answer was 4 please show me thank you

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exam Other Question

Solving an absolute value equation. 2x - 9 = 18 The length of a rectangular sign is 3 feet longer than the width. If the sign has an area of 40 square feet for advertising, find its length and width.

Can someone show me how to do this?