Question 1136642
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Of course you should know how to find the answer to the question using the slope formula.<br>
But I have seen far too many cases where a student either doesn't understand the formula or gets the wrong numbers in the wrong places, ending up with a wrong answer.<br>
I encourage students to be able to solve a problem like this using an UNDERSTANDING of what slope is.<br>
For this problem, you might do something like this....<br>
(1) The slope is negative, so the graph is downhill to the right.
(2) Since the two y values are 4 and 12 and the slope is negative, the point with y=12 is farther to the left.
(3) The difference between the two y values is 8; since the slope is -2, the difference between the two x values must be 4.
(4) So (x,12) is 4 units to the left of (7,4), making x equal to 3.<br>
ANSWER: x=3