Answer: (d) y-28=3(x-6)
Explanation:
The time period between the columns of the table is 3 weeks. Per every 3 week period there is an increase of $9, so $3 per week. Also, from the table we can work backwards to week 0 to see that the amount would have been 10. So we are looking for a linear function
y = 3x+10
Looking over the choices (we need to do some rewriting), it is only the last choice that corresponds to the above equation:
y-28=3(x-6)
y-28=3x-18
y = 3x -18 +28
y = 3x + 10
