2023 AMC 8 Problem 7

Attempt Problem 7 of the 2023 AMC 8 below, then check your answer against the video solution and professionally curated solution from LIVE by Po-Shen Loh. You can also try the full timed exam, view all 2023 AMC 8 solutions, or check the answer key.

All problems are used with official legal permission of the Mathematical Association of America (MAA).

7.

A rectangle, with sides parallel to the xx-axis and yy-axis, has opposite vertices located at (15,3)(15, 3) and (16,5).(16, 5). A line is drawn through points A(0,0)A(0, 0) and B(3,1).B(3, 1). Another line is drawn through points C(0,10)C(0, 10) and D(2,9).D(2, 9). How many points on the rectangle lie on at least one of the two lines?
00
11
22
33
44
Answer: B
Concepts:coordinate geometrylinear equation
Small hint:
Find the equations of the two lines
Big hint:
The rectangle has 15≤x≤1615\le x\le16 and 3≤y≤53\le y\le5
Video solution:
Solution video thumbnail
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Written solution:
We can graph the two lines.
From this, we see that only the top left corner of the rectangle intersects either line.
Thus, B is the correct answer.
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