I only need the equations and a small explanation on how you got those equations:
Sheila is planning to visit relatives in England and Spain. On the day that she wants to buy the currencies for her trip, one euro costs $1.50 and one British pound costs $2.00. What combinations of these currencies can Sheila buy for $700? Use three different strategies to show the possible combinations.

Question

I only need the equations and a small explanation on how you got those equations:
Sheila is planning to visit relatives in England and Spain. On the day that she wants to buy the currencies for her trip, one euro costs $1.50 and one British pound costs $2.00. What combinations of these currencies can Sheila buy for $700? Use three different strategies to show the possible combinations.