//To have the lines parallel, the gradients must be the same.
y -- 6 = 1/2 (x - 9)
y + 6 = 1/2 x -9/2
y = 1/2 x - 10.5
1: a) -51
b) -461
2: a) 18078.415936
b) <span>61715.95</span>
3 minutes and 36 seconds is the length of "Shake it off" by Taylor swift.
Source: Wikipedia
