How do I set up this problem and figure it out?

The correlation between two variables x and y is 0.5. If we used a regression line to predict y using x, what percent of the variation in y would be explained ??











How do I set up this problem and figure it out?
i think i know how but what grade are you in im in 7th just in case ur in like 8th or above it might not be accurate but x+y=0.5 then find two number that equal 0.5 and replace them with x and y hope i helped you

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