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The total cost of four pens and seven mechanical pencils is $13.25. The cost of each pencil is 75 cents.
1 answer:
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Answer:
Y=4x^2-3x+5
Step-by-step explanation:
For the standard form equation to model the values in the table, each value of x in the table should give the matching the y value when substituted into the equation. We will test each equation:
<u> for (-1,12)</u>
This does not give 12 as the answer and is not a solution.
<u> for (-1,12)</u>
This does not give 12 as the answer and is not a solution.
<u> for (-1,12)</u>
This does give 12 as the answer and is a possible solution.
We now try (2,15).
This does not give 15 as the answer and is not a possible solution.
<u> for (-1,12)</u>
This does not give 12 as the answer and is not a solution.
We now try (2,15).
This does give 15 as the answer and is a solution.
This is the standard form of the equation.