This is an altitude. Shown by the right angle on the side opposite the point.
To calculate the tax multiply $860 by .06 (6%) to get $34.40.
To calculate the total amount you'll pay add $34.40 to $860 to get $894.40.
Answer:
Given equation of the line,

If x = 0,

Thus, the line intercepts y-axis at (0,-2)
If y = 0,

Thus, the line intercepts x-axis at (3.5,0)
By joining these two points in the graph,
We will get the graph of the given line ( shown below )
1800
LCM of 10 and 15 = 30
LCM of 6 and 20 = 60
30(60) = 1800