When written in the 
form, the slope of a line is given by the coefficient 
. Moreover, two lines are parallel if the have the same slope.
Now, the slope of the known line is 4, so our line's slope will be four as well.
In general, when you know the slope of a line and one of its points 
, the equation of the line can be derived from the following formula:
Which in your case becomes
Expand the right hand side and solve for y:
You would do 120/300 = p/100 and you would get 40%
4x - 4x - 5 = -5
4x - 4x = -5 + 5
0 = 0
this equation has infinite solutions
Hello from MrBillDoesmath
Answer: multiply each by 1.5 to get the next term.
Discussion: I noticed that 7.5 is 1.5 times 5 -- and 5 is the first number in the sequence. I wondered if that was the pattern so I used Calc to multiply 7.5 by 1.5 and got 11.25. (Looking good). Then I multipled 11.25 by 1.5 and got 16.875.
Regards,
MrB
