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example 2 |
Write a variable expression to
represent each amount. |
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a. |
2 less than a number |
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rearrange |
x minus 2 |
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answer |
x - 2 |
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b. |
the product of 10 and some number |
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rearrange |
multiply 10 and x |
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answer |
10x |
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c. |
the sum of a number and 5 |
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rearrange |
x plus 5 |
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answer |
x + 5 |
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d. |
the quotient of x divided by 7 |
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answer |
x / 7 |
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example 3 |
Evaluate 2m + 3n, where m = 4, n = 6 |
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find the value |
2m + 3n |
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substitute |
2(4) + 3(6) |
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simplify |
8 + 18 |
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evaluate |
26 |
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So, the value of 2m + 3n is 26 when m is 4
and n is 6. |