501 Questions To Master GED Test Mathematics_pag172

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501 Questions to Master the GED® Mathematical Reasoning Test
 236. The correct answer is choice c. Reading the data values from left 
to right, the x-values are getting larger while the y-values are get-
ting smaller. So the points fall from left to right, which means the 
best fit line would do the same. Therefore, the best fit line would 
have a negative slope. 
 Choice a is incorrect because these points are not all collinear. 
 Choice b is incorrect because reading the data values from left to 
right, the x-values are getting larger while the y-values are getting 
smaller. A horizontal best fit line would imply there is little or no 
change in the y-values. 
 Choice d is incorrect because the best fit line would have a negative 
slope, not a positive slope.
 237. The correct answer is choice d. First find the slope of the line 
containing this line segment: 
 m = –3 – (–5)________
3 – (–2) = 2__
5
 To get other points on the line, you can add 2 to the y-coordinate 
and add 5 to the x-coordinate of a point known to be on the line, or 
you can subtract 2 from the y-coordinate and subtract 5 from the 
x-coordinate of a point known to be on the line. Using the latter 
twice in succession gives the points (–7,–7) and (–12,–9). 
 Choice a is incorrect because you seem to have eyeballed the 
y-intercept. You must use the slope of the line to accurately place 
points on it. 
 Choice b is incorrect because you subtracted 2 from the 
x-coordinate and 5 from the y-coordinate of point A but should 
have done the reverse. 
 Choice c is incorrect because you added 2 to the x-coordinate and 
5 to the y-coordinate of point B but should have done the reverse. 
501_MathQues_05_119-160.indd 157 7/26/17 4:02 PM