This graph shows test scores for two years, 2009 and 2010, across three grade levels. Scores increased from 2009 to 2010 for all three grades. A linear trend line indicates that if the trend continues scores will continue increasing each year for every grade level.

1. 70
60
50
40 2009
2010
30
Linear (2010)
20
10
0
grade 1 grade 2 grade 3