Question

Square meters of ceiling Number of tiles 1 10.75 10 100.75 9.3 100 What is the value of the red X? Write your answer as an algebraic expression using variable "a".

Answer 1

x = 9a + 1.75

slope = (100.75 - 10.75)/(10 - 9) = 90/9 = 9

offset: 10.75 = 9(1) + b

10.75 - 9 = b

1.75 = b

b = 1.75

y = mx + b

in this case: x = 9a + 1.75