Determine which linear relationship is a direct variation. State the constant of variation. Select all that apply Table 1: Table 2:
Age (x) 11 13 15 19 Price (x) 20 25 30 35
Grade (y) 5 7 9 11 Tax (y) 4 5 6 7

answer:  

\boxed {\frac{1}{5}}  

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

solution-

60 *   \frac{1}{5}   = 12

90 * \frac{1}{5} = 18

75 * \frac{1}{5} = 15

━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

hence, the answer would be \boxed {\frac{1}{5}}