Answer:
The equation is:
180 + 6x = 160 + 8x
Number of visits = 10
Explanations:
Let the number of visits be x
Sign up fee for Selena Gomez = $180
Charge per visit for selena Gomez = $6
Total amount spent by Selena Gomez = 180 + 6x
Sign up fee for Demi Lovato = $160
Charge pervisit for Demi Lovato = $8
Total amount of money spent by Demi Lovato = 160 + 8x
If the spent the same amount:
Total amount spent by Selena Gomez = Total amount of money spent by Demi Lovato
The equation is:
180 + 6x = 160 + 8x
To know the number of visits they would have made to spend the same amount, we have to solve the above equation and get the value of x
180 - 160 = 8x - 6x
20 = 2x
20 / 2 = x
x = 10
They will make 10 visits