Question 75791
This is {{{y = log(2,x)}}}
This says y is a log. A log is an exponent to some base. The base is 2.
You can rewrite it as {{{2^y = x}}}
Now pick some values of y  and find x.
y = 0
x = 1
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y = 1
x = 2
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y = 3
x = 8
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y = 4
x = 16
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y = -1
x = 1/2
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y = -2
x = 1/4
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you can plot these points. Note that x can never be negative