Aimee must add together the following numbers:
3.50 + 4.00 + (-1.25) + (-7.50) + 5.25 + 2.00
as her first step, aimee writes:
(3.50 + (-7.50)) + (-1.25 + 5.25) + (4.00 + 2.00)
which is the best explanation of what aimee did in this step?

The equation of the line is y = -3/7x - 23/7

Step-by-step explanation:

To start we need to find the slope of the original line. We can do this by solving the equation for y.

3x + 7y = 21

7y = -3x + 21

y = -3/7x + 3

Now we know the slope to be -3/7. Since parallel lines have same slopes, we know the new line also will have a -3/7 slope. We can now use that along with the given point in point-slope form to find the equation.

y - y1 = m(x - x1)

y + 5 = -3/7(x - 4)

y + 5 = -3/7x + 12/7

y = -3/7x - 23/7