Acar tracked 640 miles at a certain speed. if the speed of had been 8 mph faster, the trip could have been made in 4 hours less time. find the speed.

Step-by-step explanation:

Distance = rate × time, or  

d=rt, so

         Let x = original speed.

Then x + 8 = faster speed

       Let t₁  = time at original speed

      And t₂ = time at faster speed

    Then t₂ = t ₁ - 4

Check:

OK.

the slope of the line is 60

one point on the line is (40,10)

step-by-step explanation:

in the equation outside the parenthesis the equation always tells you the slope. in this case it is 60.

in the parenthesis is also says 40 which is x because it is near the x and 10 is y because it is near y.

yes the total will be same because in both of them the expression.is rearranged but their sign remains the same hence it hss just been shuffled