Identify which table shows a direct variation.

two tables. for each table the column headings are x and y. table 1 has column one values of 1, 2, 3 and column 2 values of 19, 38, 57. table 2 has column 1 values 5, 6, 7 and column 2 values 48, 72, 84.

a.
table 1 only

b.
table 2 only

c.
both tables

d.
neither table