Although i could be wrong i think that the linear equation for the question would be
x=1/5y+2/5
The y intercept for the equation is 1/5
The slope is 2/5
the cost is proportional to the number of people because a constant value 9.50 exists where each measure of the number of people multiplied by this constant gives the corresponding measure in y
m^5 x m^8 = m^13
Steps
1. You just have to add 5 + 8 = 13 and then plug that back in.
Hope this helped!!!