The cost of one yard of fabric is required.
The cost of one yard of fabric is [tex]\$6[/tex]
Cost of [tex]3\dfrac{1}{2}\ \text{yards}[/tex] of fabric is [tex]\$21[/tex]
[tex]3\dfrac{1}{2}=\dfrac{7}{2}\ \text{yards}=\$21[/tex]
We need to divide both sides by [tex]\dfrac{7}{2}[/tex]
[tex]1\ \text{yard}=\dfrac{21}{\dfrac{7}{2}}[/tex]
[tex]=21\times \dfrac{2}{7}=\$6[/tex]
The cost of one yard of fabric is [tex]\$6[/tex]
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