Answer:
1. T varies directly as y
- [tex]\LARGE\text{$\tt{T=ky}$}[/tex]
2. N varies directly as t
- [tex]\LARGE\text{$\tt{N=kt}$}[/tex]
3. a is directly proportional to b
- [tex]\LARGE\text{$\tt{a=kb}$}[/tex]
4. Y varies inversely as x
- [tex]\LARGE\text{$\tt{Y=\frac{k}{x}}$}[/tex]
5. Z varies inversely as P
- [tex]\LARGE\text{$\tt{Z=\frac{k}{P}}$}[/tex]
6. M is inversely proportional to N
- [tex]\LARGE\text{$\tt{M=\frac{k}{N}}$}[/tex]
7. B varies jointly as r and s
- [tex]\LARGE\text{$\tt{B=krs}$}[/tex]
8. U varies jointly as c and d
- [tex]\LARGE\text{$\tt{U=kcd}$}[/tex]
9. U varies directly as c and inversely as d
- [tex]\LARGE\text{$\tt{U=\frac{kc}{d}}$}[/tex]
10. B varies directly as a and inversely as the square of c
- [tex]\LARGE\text{$\tt{B=\frac{ka}{c^2}}$}[/tex]
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