find z-score if x points are 4,6,7,8 and y points are 5,13,17,21

i am stuck on a statistics assignment and I have math anxiety so someone please help
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The x and y points are in a linear relationship: y=4x-11. The gradient is 4 because, if we take any two ordered pairs (x1,y1) and (x2,y2), (y2-y1)/(x2-x1)=4. The correlation coefficient is 1 (exact direct relation).

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