Answer:
B
Step-by-step explanation:
Let y = f(x) and rearrange making x the subject
y = x² + 7 ( subtract 7 from both sides )
y - 7 = x² ( take the square root of both sides )
± 
= x
Change y back into terms of x, thus
(x) = ± 
Would have to go with x=5
Answer:
x is 3
Step-by-step explanation:
For every 10 unit increase in x, there's a 6 unit decrease in y.
Your slope is -6/10 or -3/5.
This gives us y = -3/5 x + b.
Using (25,94), we can solve for b:
94 = -3/5 (25) + b
94 = -15 + b
109 = b
So, y = -3/5 x + 109.
Let's double check it works with x = 45:
y = -3/5 (45) +109
= -27 + 109
= 82
Looks like we're good.
You can use the slope formula
1 - 4 -3
------ = ------
x - 1 x - 1
x = 0
