exam Maths Puzzle Numerical Ability

convert to slope intercept form:

-5/8x - 3/7y= 2/3

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A mixture of 10% acid and 90% water is added to 5 liters of pure acid. The final mixture is 40% water. How many liters of water are in the final mixture? In parallelogram LMNO, an exterior angle at vertex O measures 72 degrees. Find the measure, in degrees, of L. First I made a diagram of a parallelogram and label LMNO. I have no id