Explanation:
you subtract -4 by 7.
then you hav 5x=7
you divide 5x by 5 and seven by five so your x= that answer
then you put that number into the x in the second equtaion
then you subtract that number after multiplying the 6 by the number x equals
then you divide 2y by 2 and 22 by 2 and thats your y value