M.1HS8.36

Solve systems of linear equations exactly and approximately (e.g., with graphs), focusing on pairs of linear equations in two variables.

Example Problems
Candace purchased 2 notebooks and 3 pencils for a total of $9.
A month later, she purchased 3 notebooks and 2 pencils at the same prices, for a total of
$8.

How much does one notebook cost?
Erin bought 3 notebooks and 5 packs of pencils for a total of $15.
A month later, she bought
4 notebooks and 4 packs of pencils at the same prices, for a total of $14.

How much does a pack of pencils cost?
Natalie purchased 4 notebooks and 7 pens for a total of $22.

Another time, she purchased
5 notebooks and 5 pens (at the same prices) for a total of $20.

How much does one notebook cost?
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