Answer:
90 hardcover books
Step-by-step explanation:
We can solve this by setting up a couple of equations.
Let's allow x to represent the number of paperbacks Tim owns, and allow y to represent the number of hardcover books he owns.
Using the information in the question, we can write the equations:
1)x = 4y-3
2) x+y=447
Let's rearrange equation 1 so that it is in standard form:
x-4y=-3
And then let's multiply equation 2 by 4 so that we can cancel out y when we solve the system of equations:
4(x+y=447)
4x+4y=1,788
Then we can add the two equations and solve for x:
1) x-4y=-3
+ 2)4x+4y=1,788
------------------------------------
5x=1,785
x=357
So now we now the number of paperback books Tim has is 357. Let's plug this into one of the original equations to solve for the number of hardcover books (y):
357+y=447
y=90
And now we know that Tim owns 90 hardcover books.
Answer:
<u>65.</u>
Step-by-step explanation:
1. Write the expression.

2. Expand the expression.
![3x3x3x3 -[(-4)x(-4)]](https://tex.z-dn.net/?f=3x3x3x3%20-%5B%28-4%29x%28-4%29%5D)
3. Simplify.
![81 -[16]\\\\65.](https://tex.z-dn.net/?f=81%20-%5B16%5D%5C%5C%5C%5C65.)
The answer is 262 and I hope you have a nice week yours ac80922
Answer:
(x, y) = (-10, -7)
Step-by-step explanation:
#1 Multiply the first equation by 7
#2 Then multiply the second equation by 5
1. 14x - 35y = 15
2. 10x - 35y = 55 (-
---------------------------
4x = -40
x = -10
Then go back to equation one and replace "x" with -10
2(-10) - 5y = 15
-20 - 5y = 15
-5y = 15 + 20
-5y = 35
5y = -35
y = -7
The answer is
(x, y) = (-10, -7)
Hope this helps!
Have a nice day!
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Let

Find the equation in terms of y in the form x = f(y).

Replace y by x in the right hand side, which will be the required inverse of the function.