The ratio of the number of coins to the number of notes Mrs James has in her purse is 2 : 5. If she has 34 coins, how many notes does she have?

85 notes

Step-by-step explanation:

2 coins : 5 notes

1 coin   :    2.5 notes

34 coins : __ notes

^

I

I

(multiply by 2.5 to get amount of notes)

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18