Direct Variation: [tex]\frac{y}{x} = k[/tex]
[tex]\frac{15}{2} = k[/tex]
when y = 7: [tex]\frac{7}{x} = \frac{15}{2}[/tex]
14 = 15x
[tex]\frac{14}{15} = x[/tex]
Inverse variation: y*x = k
15 * 2 = k
30 = k
when y = 7: 7 * x = 30
[tex]x = \frac{30}{7} [/tex]
