The number of checks for credit union to have a better deal is an illustration of inequalities.
The credit union is a better deal when writing 2 or more checks per month.
Let the number of checks be x.
For the local bank (L):
The equation is: [tex]L =8 +2x[/tex]
For the credit union (C)
The equation is: [tex]C = 5 + 5x[/tex]
For credit union to have a better deal, then:
[tex]C > L[/tex]
So, we have:
[tex]5 + 5x > 8 + 2x[/tex]
Collect like terms
[tex]5x - 2x > 8 - 5[/tex]
[tex]3x > 3[/tex]
[tex]x > 1[/tex]
Hence, the number of checks per month must be greater than 1 for the credit union to have a better deal.
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