Select the graph of the solution. Click until the correct graph appears. 3x + 1 < 7 (line graph)

3x + 1 < 7 ... subtract 1 from both sides

3x < 7 - 1

3x < 6 ... divide both sides by 3

x < 6/3

x < 2

there will be an open circle on 2 ... because the problem has no equal sign ... the line will be shaded to the left ... because it is less then.