Let's think of this like a point. We know the y-value, but not the x-value. Therefore, in order to find b, we should plug in our known y-value, 19, for r(x).
19 = 2b + 1 || We can leave it as x in our equation or change it to b. Either way you will get the same answer. I changed it to b in this case just to follow through with what the question is asking.
18 = 2b
b = 9
Hope this helps!! :)
twenty-one over eight ( 
) or two and five eights
<u>Part 1: Finding </u>
Note that 
In this case, it is 
<u>Part 2: Domain</u>
For the domain, we need to make sure the radicand of h(x) is greater than or equal to 0, so we get 
Slope-intercept form is simply y=mx +b
your equation is 3x -y = 7
rearranging that to y = mx +b makes it look like this:
- y = -3x +7
y =3x -7
making m =3 and b=-7, so your answer is C
