Question 1154205
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I prefer to use my understanding of slope, rather than a mathematical formula, to solve problems like this.<br>
I also encourage students to do that, since it helps gain an understanding of slope, whereas plugging numbers into a formula does not.<br>
(Furthermore, if you plug the numbers in the wrong places in the formula, you probably won't get the right answer....)<br>
The second of the two given points is 10 to the right of the first.
Since the slope is -1/5, the second point must be 2 down from the first.
2 down from the first, ending at -7, means the y coordinate of the first point is -5.<br>
ANSWER: k = -5<br>