Last night you went to a restaurant, and the bill for 3 adult meals and 2 children’s meals was £73. Last week you went to the same restaurant and paid £89 for 2 adult meals and 5 children’s meals.

Let a = cost of an adult meal,

and c = cost of a child meal.

A) Form an equation for last night’s meal

? = ?

B) Form an equation for last week's meal

? = ?