Sound travels 2,301 miles in 3 hours.
How far can sound travel in 1 hour?

767 miles.

Step-by-step explanation:

2301 / 3 = 767 miles in 1 hour.

767 miles

Step-by-step explanation:

Write and solve an equation of ratios:

         x              1 hr

=

 2301 miles       3 hrs

Cross multiplying, we get 3x = 2301, and dividing both sides by 3 results in

x = 767.  This is how far sound can travel in one hour.

5x + 3y = - 4

step-by-step explanation:

the equation of a line in standard form is

ax + by = c ( a is a positive integer and b, c are integers )

express the line first of all in slope- intercept form

y = mx + c ( m is the slope and c the y-intercept )

to calculate m use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (7, - 3) and (x₂, y₂ ) = (4, - 8)

m = = -

y = - x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (4, - 8 ), then

- 8 = - + c ⇒ c = -

y = - x - ← in slope-intercept form

multiply all terms by 3 to eliminate the fractions

3y = - 5x - 4 ( add 5x to both sides )

5x + 3y = - 4 ← in standard form