The number of miles driven varies directly with the number of hours in the car. Billy drives 171 miles in 3 hours, so he could d
2 answers:
Remember that direct variation means that you have a relationship of the form
In this case it's a special equation, namely distance=rate*time. So first we have to find the rate given the information in the problem:
Now we know that the rate is constant since Billy's distance varies directly with time. The next step is to find distance given a different amount time:
You can finish that one off!
In this case it's a special equation, namely distance=rate*time. So first we have to find the rate given the information in the problem:
Now we know that the rate is constant since Billy's distance varies directly with time. The next step is to find distance given a different amount time:
You can finish that one off!
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y = - x - 34
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 ) = (- 68, 0 ) and (x₂, y₂ ) = (0, - 34 )
m = =
= -
the y-intercept = (0, - 34 ) ⇒ c = - 34
y= - x - 34