Book Maths Puzzle Algebra

How do i write this into a linear system problem?



" You go to the video store to rent 5 movies for the weekend: Movies rent for $2 and $3. You spend $13. How many $2 movies did you rent? How many $3 movies did you rent?



How do i write the two equations for that so i can solve it.

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Book Other Question

i want to make sure the following steps for solving linear system



y=3x & x=3y



I think answer is x=9x and y=9y
how do you work this problem
Order of Operations
2x(y+3)= 2x(y)+ 2x(3)= 2xy +6x


and


[5-2(5*2)]/[(20)/2]+ 5