15-3b=63
subtract 15 from both sides
-3b=48
divide -3 from both sides
b= -16
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Answer:

Step-by-step explanation:
.
m is the slope of the line. To find it we can do
which is the difference between the y-coordinates divided by the difference between the x-coordinates.
So:
. Now we have the slope, let's input a set of coordinates into the equation so that we can find the constant
.

- Re-arranging to get b
Now re-write the equation as we have the constants.

A radius of 0.75 would be rational because the decimal ends and does not repeat itself.
The -4 represents a horizontal translation of 4 units to the right