Think of x being the cost of a knife and y being the cost of a spoon.
x = 3y would show that a knife cost 3 times what a spoon does.
We know from the info that 12 knives and 9 spoons = 82.80. It could be written as 12x + 9y = 82.80
Substitute 3y from our formula into the equation for x.
12(3y) + 9y = 82.80 becomes 36y + 9y + 82.80 which becomes 45y = 82.80, then divide both sides by 45 to solve for y and you get 1.84
Going back to our original equation, x = 3y, we can substitute 1.84 for y and find that x = 5.52.
So we find a knife cost $5.52
I think the answer may be no solution
Answer:
x+4
Step-by-step explanation:
Answer:
Step-by-step explanation:
Answer:
It will take 4 hours to dig in the garden
Step-by-step explanation:
First we have to calculate the diameter, for this we will use the formula to calculate the circumference of a circle and we will clear the diameter
d = diameter
π = 3.14
c = circumference
c = π * d
d = c / π
d = 88yd / 3.14
d = 28.025yd
round to the nearest whole number
28.025 = 28
d = 28yd
To know how many hours it takes, we divide the diameter by the speed
t = time
v = velocity
t = d / v
t = (28yd) / (7yd/h)
t = 4h
It will take 4 hours to dig in the garden