Answer:
8 hours.
Step-by-step explanation:
let x represent number of hours.
We have been given that Trey mechanic will fix Trey's car at a rate of $20 per hour, plus $400 for the cost of a part.
So total cost of repairing a car for x hours by Trey mechanic would be
.
We are also told that the neighbor has the needed part and will fix the car for only $70 per hour. So total cost of repairing a car for x hours by neighbor would be
.
To find the number of hours, when the cost of fixing the car by either person will be equal, we need to equate both expressions as:

Let us solve for x.




Therefore, after 8 hours the cost of having the car fixed by either person will be the same.
Answer:$30
Step-by-step explanation:
i divided the fraction into 20 and the multiplied hope this helped!
Answer:
with what I'll try to help
The answer is yo uour question is E
Answer:
y = - x + 5
Step-by-step explanation:
The equation of a line in slope- intercept form is
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 ) = (4, 1) and (x₂, y₂ ) = (- 2, 7)
m =
=
= - 1, hence
y = - x + c ← is the partial equation
To find c substitute either of the 2 points into the partial equation
using (4, 1), then
1 = - 4 + c ⇒ c = 1 + 4 = 5
y = - x + 5 ← equation of line