Answer:
15. y = 6x
16. x = 11
Step-by-step explanation:
15. A direct variation equation is of the form ...
y = kx
Solving for k, we find ...
k = y/x = 42/7 = 6
The equation is y = 6x.
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16. Filling in the given values, we have ...
66 = 6x
11 = x . . . . . . . divide by 6
So,
I like to simplify a fraction first. This is what I do when I'm in a store trying to find the unit price.

Factor.

Cross out ones.

Multiply it out.

In my head, I remember that one-eighth is equal to 0.125.
So seven-eighths is equal to 0.125 times 7.
0.125 * 7 = 0.875
Convert to percent form.
0.875 --> 87.5%
James answered 87.5% of his quiz correctly.
I actually have the decimal equivalents for eighths in my head when I'm shopping. So once I get seven-eighths, I immediately know how much that is. I can also subtract 0.125 from 1.000 to get seven-eighths.
? -2 -1 0 1
-1-2=-3
The answer is -3
I think its 12.
I could be wrong. Let me know.
-Steel jelly