Question

For several years, Graham has gathered data on students who own a computer and on their performance on a typing-speed test. He creates the linear model y = 3.8x + 17.4 where y represents the typing speed, in words per minute, of a student and x represents the number of years the student has owned a computer. According to Graham’s model, what is the approximate speed of a student who has owned a computer for three years?

Answer 1

Y = 3.8x + 17.4
y = (3.8 x 3) + 17.4
y= 11.4 + 17.4
y = 28.8 
28.8 words per minute for a person who has owned a computer for 3 years