The weight of the water exerts pressure on a diver. At a depth of 10 feet, the water pressure is 19.1 pounds per square inch and at a depth of 14 feet, the water pressure is 20.9 psi.
Complete the statements and sketch the qualitative graph of this function.
The input or X- Variable is ……………..
The output or Y- Variable is………….

The correct answer is: 0.45x + 14.6

SOL – The input or X- Variable is depth of the water in feet
The output or Y- Variable is pressure exerted on the diver in pounds per square inch
Acc. to the question, when x₁ = 10, y₁ = 19.1
x₂ = 14 , y₂ = 20.9
Using two – point form, equation of the line is
(y – y₁) = m (x – x₁) where m = 
Slope = 
=.   =   = 0.45
Equation of line is (y – 19.1) = 0.45 (x – 10)
y – 19.1 = 0.45 x – 4.5
y = 0.45x – 4.5 + 19.1
y = 0.45x + 14.6