Answer:
The equation is;
d = 1.25s
Step-by-step explanation:
Here, we start by getting the price of a single song
From the question;
4 songs = $5
Thus, 1 song will be $5/4 = $1.25
So the proportionality constant is $1.25 per song
To write the relationship, we have;
d = 1.25s
Where d is the cost in dollars and s is the number of songs
12 I think? I’m just guessing sorry.
Answer:
base = 17.71 ft
height = 9.71ft
Step-by-step explanation:
Since we are not given the base and heigh directly, to answer this question we need two equations: (1) one to express the area (A) of a triangle, and (2) one describing the fact that height (h) and the base (b) lengths are related. Setting up and solving the system of these two equations for base leads to a quadratic equation:
which has two solutions but one is negative, i.e., not applicable. The good solution for base is .
Since we know the height is 8 ft less than the base, the height must be 9.71ft
2.1x + 4.2y = 14.7 is the same as x + 2y = 7 (divide both sides by 2.1)
-5.7x-1.9y=-11.4 is the same as 3x + y = 6 (divide both sides by -1.9)
Rearrange the first equation to get x = 7 - 2y and substitute into the second equation, 3(7 - 2y) + y = 6, 21 - 6y + y = 6, 5y = 15, y = 3
Substitute y = 3 into the first equation x + 2(3) = 7, x = 1
x = 1 and y = 3
-3xy
Im pretty sure this is right.