A line passes through the point (–2, 7) and has a slope of –5. mc009-1.jpg What is the value of a if the point (a, 2) is also on
the line?
2 answers:
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So the number of pencils bought can be represented by an equation: 
, where n is the number of notebooks bought. Since Helen bought 5 notebooks, simply plug 5 into n: 
. So Helen bought 12 pencils.