Problem 80 of 7
Find the missing coordinate for unit-circle point (7/25, y) in Quadrant I.
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use identity and quadrant.
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Known coordinate and quadrant must determine the missing coordinate on x^2+y^2=1.
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Solution
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1. Use x^2+y^2=1.
2. Solve for the square of the missing coordinate.
3. Use quadrant signs to choose the correct root.
Use the worked steps, then substitute the final answer back into the original relationship to confirm it satisfies the prompt.
Both plus/minus values when quadrant is specified.