Solve each system by substitution

-4x + y = 6 () -5x + y = -2 () 3x - 8y = 24
-5x - y= 21 () -3x + 6y = -12 () -5x + y = -3

Simplify the expression 10/11(22z) + (a+5) -1

Afootball is throw by a quarterback to a receiver

One number is 4 less than 3 times a second number. if 3 more than two times the first number is decreased by 2 times the second number, the result is 11. use the substitution method. what is the first number?