Brian sat in a massage chair at a shopping mall for 8 minutes and paid $9. Norah sat in the same massage chair for 12 minutes and paid $11. If the relationship between the number of minutes and the amount paid is linear, with x representing the amount paid in dollars, which of these equations models this situation?
+36916 y= mx + b
two data points $ 9,8 and $11,12
m = 8-12 / 9-11 = -4/-2 = 2
y = 2x + b
8 = 2(9) + b b = -10
y = 2x -10 where x = dollars and y is minutes
