Answer:
2z-6
Step-by-step explanation:
2(z-3)
2(z)-2(3)=2z-6
Step-by-step explanation:
If x = the amount of 12% and y = the amount of 20%, then x + y = 80
Since we need 80 grams of 15%, 80(.15) = 12.
We are given that .12x + .20y = 12.
We can solve the first equation for x or y. Let's do x.
x = 80 - y
.12(80 - y) + .20y = 12
9.6 - .12y + .20y = 12
.08y = 2.4
y = 30
x = 80 - 30 = 50
Let y directly proportional to X
thus y = CX
where c is proportionality constant
given c= 9
thus y = 9x
