Rosalie earns extra money by working as a babysitter over the weekend. she charges $10 to drive to the home and an additional $8 per hour.

Suppose that Rosalie works X hours in per day.

Then we can write the amount of money tat Rosalie makes in the day as:

Money = the $10 for drive to the home + X times $8, because she charges $8 per hour.

So the equation is:

M = $10 + $8*X

if she works two days per week (the two days of the weekend)

She makes 2M = $20 + $16*X