Pablo is driving to Denver. Suppose that the distance to his destination (in miles) is a linear function of his total driving ti
1 answer:
Answer:
40 miles to his destination.
Step-by-step explanation:
If the distance to the destination is a linear function of his driving time then the function f(x) has the form f(x)=mx + b
Now we're going to write two equations with the data that was given to us to find the function for this problem:
Therefore the equation f(x), is f(x) = -0.75x+103.75
To find how many miles he will have after driving 85 minutes:
He will have 40 miles to his destination
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Answer:
No because it contains points (3,4) and (3,-4). You cannot have a x assigned to more than one y-value if you want it to be a function.
Step-by-step explanation:
A function has one output per input.
If we are trying to determine if the given is a function of x, then x is the input.
However I can get two outputs from plugging in x=3.
Subtract 9 on both sides:
Take the square root of both sides:
.
So input x=3 yields y=4 and y=-4.
Since this input has more than one output then the given is not a function of x.
----Also!
If you graph the equation, it is a circle with radius 5 and center (0,0). So I could I plug in any number for x between -5 and 5 excluding -5 and 5 which would yield only one output each. Since plugging in either one gives:
Subtract 25 on both sides:
Simplify:
There is only one value y such that when you square it gives you 0. That is 0.
x=5 only gives y=0 and x=-5 only gives y=0.
There is no circle, unless it is a circle with radius 0 which means it really wouldn't be a circle, that is a function.