Answer this, it's a long overdue assignment .

13.) x=3

14.)

Step-by-step explanation:

13) plug the first equation into the second getting 3x-x-5=7 the add the x's, 4x-5=7 add five to both sides now you get 4x=12 then divide both sides by 4 getting x=3

14.) you have to add both equations vertically that gets you 5x+3y=14. then you have to solve.

5x+3y=14 subtract 3y from both sides getting 5x=14-3y divide by 5 both sides so, x=14-3y over 5 plug that into the equation and hopefully get your answers you need:)

Just learned this on my online class but I hope this helps some!

the answer is 31.27mph

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.