Question 1168754
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You have the correct equation M = 90-7.50b which is the same as M = -7.50b+90


From here you plug in values b = 0, b = 1, b = 2 to get corresponding values of M


You've already shown that b = 0 leads to M = 90.


You repeat for b = 1
M = 90-7.5b
M = 90-7.5*1
M = 82.50
Telling us that buying 1 book means Noah has $82.50 left


And for b = 2 also
M = 90-7.5b
M = 90-7.5*2
M = 75
Showing that buying 2 books means he has $75 left


The table looks like this
<table border=1 cellpadding = 4>
<tr><td>B</td><td>M</td></tr>
<tr><td>0</td><td>90</td></tr>
<tr><td>1</td><td>82.50</td></tr>
<tr><td>2</td><td>75</td></tr>
</table>


So it seems like you're on the right track.
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