Solve the system using substitution. Show all your work.

4x+5y=7
y=3x+9

Since we know what y is, it is 3x+9, we can substitute 3x+9 in for y in the first equation

4x+5y=7

Substitute 3x+9 in

4x+5(3x+9)=7

Distribute the 5

4x+ 5*3x +5*9=7

(4x+15x)+45=7

Combine like terms

19x=-38

Divide both sides by 19

x= -2

Now we know x, and have to find y. Substitute -2 in for x in either of the equations

y=3x+9

y=3(-2)+9

y=-6+9

y=3

amount of oatypop that contains the prize = 40%

amount   of oatypop which doesn't contain the prize = (100-40)=60%

probability that hannah will win a prize

    = s +f s +f f s+ff   f s+ff f f s+ infinity.where f= failure,s= success

=   or 60%

probability that hannah only has to buy 3 or less boxes before getting a prize= (s) and ( f s) and (ff s) and (f f f s)

        = = 87.04 %  

step-by-step explanation:

2 1/2 feet

step-by-step explanation: