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Tham khảo tài liệu 'college test english 7', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | BASIC SKILLS FOR COLLEGE Coordinate Geometry 1. Which line below has no slope D C-------------- X----------------X----------- a. Line A b. Line B c. Line C d. Line D Let s review how to tell the slope of a line by looking at positive negative slope slope D C XX zero no slope slope Thus choice d is correct. This line has no slope because sloe changein slope change in X There is no change in X for Line D. No change zero which means we would have a zero in the denominator of our slope formula. Zeroes and denominators do not mix Actually dividing by zero is technically termed undefined as in you can t do it Therefore there is no slope Line C is interesting to look at as well. Here there is a zero slope because there is a zero in the numerator of the slope formula. There is a zero in the numerator of the slope formula because there is no change in y. 2. Line AB below contains the points 2 3 and a. y X 1 b. y 3x 2 c. y X 1 d. y 2x 3 The equation of a line is y mx b where m is the slope of the line -Axx and b is the y intercept. We are given 2 points to work with so first we will determine the slope. m Ạ- V2 -y1 m Ax X2 X1 74 CHAPTER 4 LearningExpress Skill Builders 3 2 The equation becomes 6 _ 1 30_11 2 3 _ 3 12 -29 2 3 Thus the answer is b. 1 English to Equation Putting m 1 into the equation y mx b we get y x b. We can use one x y pair to figure out what b is. Let s use the point 2 3 and stick them into the 1. Joe only owns 12 more than half the amount of CDs stacked on his dresser and the rest were bor- rowed from a friend. If there are a total of 52 CDs in the stack which equation represents the amount of CDs that he borrowed B a. B 12 x 52 equation below y x b 3 2 b b. B 52 -12 b 1 So our final equation is y x 1 choice c. c. B 5 52 -12 d. B 52 - 12 ỳx 52 First realize that there are 52 CDs total and that some ALGEBRA are Joe s and some are the ones he borrowed. So the basic Substitution idea would be 52 total CDs Joe s Joe borrowed. We know we should call the .
