Secondary revision · Biology - G11

The Heart

Question 1 of 10 Grade: Eleven - G11

16 Name the parts labelled X, Y and Z.

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From second equation: y = 3 - x. Substitute into first: x² + (3 - x) = 5 → x² - x + 3 = 5 → x² - x - 2 = 0 → (x-2)(x+1)=0 → x=2 or x=-1. When x=2, y=1; when x=-1, y=4. Solutions: (2,1) and (-1,4)

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