Answer:
Step-by-step explanation:
Question One.
y = -0.4*x + 6.92
The time spent texting is the x value you are given
x = 3.9
y = ?
The value you put in for x is 3.9 and you must use the line. The graph otherwise has nothing to do with it.
y = -3.9*0.4 + 6.92
y = -1.56 + 6.92
y = 5.36
What this is telling you is that the line predicts that if you spend 3.9 hours texting, you should (the line predicts) be exercising 5.36 hours.
Move on.
However what is actually true is that you spent just 4.50 hours exercising.
That means that you actually exercised 6.36 - 4.50 = 0.86 hours less time exercising that the line predicts you would have. So the answer to put in the top line third box from the left is 5.36 and the answer you put in the 4th box from the left is 0.86 hours.
Question Two
y = - 0.4 * x + 6.92
x = 5.5 hours texting
y = ?
y = - 0.4 * 5.5 + 6.92
y = - 2.2 + 6.92
y = 4.72 hours exercising.
The line says you should have exercised exercised 4.72 hours.
You actually did 5.5
So you exercised 5.5 - 4.72 = 0.78 more than you would have if you exercised just what the line predicted you would have done. So you exercised 0.78 hours more than the line thought you should.
Now here's the catch. One of you numbers has to be minus, but which one? You will have to rely on your notes to get the answer to that. You must have been given a sample question
If I had to guess I would say that the minus number is -0.86 because you are under the predicted amount.
The numbers are otherwise correct.
