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13 Mar 2019, 01:15
Kudos
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
69% (01:43) correct
31%
(01:49)
wrong
based on 62
sessions
History
Date
Time
Result
Not Attempted Yet
Given points A(2, 3) and B(x, y) in the rectangular coordinate system above, if y = 4.2, then x =
A. 2.6
B. 2.8
C. 2.9
D. 3.0
E. 3.2
Attachment:
c11c_r107.png [ 10.87 KiB | Viewed 4534 times ]
14 Mar 2019, 05:16
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To some of us the answer may not be as obvious. For example, on the basis of intuition you may have immediately thought that you need to calculate the distance between the points here, but the equation produced is a horrible one. You can leave it and move to see if there is anything else you may know.
Next, what other basics do you know about coordinate geometry. Well you can find the slope, but this will probably lead to an equation similar to the above, and although one variable will overlap, the second will not.
What else? y = mx+c. Can we find M this way? Yes, since we have one set of definite X, Y coordinates and C appears to be zero. Emphasis on 'appears'. The sticklers might say that we are not 100% sure that this line passes through 0,0 and maybe you are right and this is something that can be addressed in the question but on the basis of a definite 0 y-intercept the question is pretty solvable in fraction (5/4 = 1.2) or other terms.
Next, what other basics do you know about coordinate geometry. Well you can find the slope, but this will probably lead to an equation similar to the above, and although one variable will overlap, the second will not.
What else? y = mx+c. Can we find M this way? Yes, since we have one set of definite X, Y coordinates and C appears to be zero. Emphasis on 'appears'. The sticklers might say that we are not 100% sure that this line passes through 0,0 and maybe you are right and this is something that can be addressed in the question but on the basis of a definite 0 y-intercept the question is pretty solvable in fraction (5/4 = 1.2) or other terms.
