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x² + y² = 100
x = 3/4y
y² + (3/4y)² = 100
x = 3/4y
y ² + 9/16 * y² = 100
x = 3/4y
25/16 * y² = 100
x = 3/4y
5/4 * y = 10
x = 3/4y
y = 8
x = 6
y = 8
lub x = -6
y = -8