exam Maths Puzzle Numerical Ability

The deepest part of the lake is indicated by the unknown depth on diagram. Based on the 5 depth measurements above the mean (average) depth of the lake is 46 feet. What is the me

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Solve for x and y

2/3-2yi=2x+4/5

I was doing okay with my homework and then I ran into this one and was lost. Thank you for your help. What is the equation for the line that passes through the point (0,4) with a slope of -2? Thanks.