Answer:
y = -4, x = -9
Step-by-step explanation:
System: -2x + 5y = -2, x - 3y = 3
Multiply the second equation: 2x - 6y = 6
Elimination:
-2x + 5y = -2
<u>+ 2x - 6y = 6</u>
- y = 4 --> y = - 4
Plug in: x - 3(-4) = 3
x + 12 = 3
x = -9
Where <em>x </em>is the number of books sold, <em>i </em>is income, and <em>c </em>is cost:
<em>c = 4x + 3500 </em> ($4 per book plus the 3500 flat marketing fee)
<em>i = 15x </em>($15 per book)
You are looking for the point where these intersect: the intersection is where the income is equal to the cost, and at any point after that the income is greater than the cost. So, set the equations equal to each other:
<em>4x + 3500 = 15x </em>
subtract 4x from both sides
<em>3500 = 11x</em>
divide both sides by 11
<em>x = 318.181818</em>
So, you would have to sell a minimum of 319 books in order to make a profit.
X+3 y-1 the second choice
The simplest from of 3/12 is 1/4.
3/12 divide 3 by 3 and 12 by 3 an you get 1/4
Note: In option A, it should be "+" instead of "(".
Given:
The expression is
To find:
The equivalent expression.
Solution:
We have,
Using distributive property, we get
On combining like terms, we get
The expression is equivalent to the given expression.
Therefore, the correct option is A.