I think the correct answer is <span>a)x in first equation
</span>
Look at the <span>first equation:
</span><span>3x + 6y = 9
</span>You can divide both sides by 3 to get:
x + 2y = 3
And then solve it for x:
x = 3 - 2y
<span>Now you can substitute x to 3-2y in the second equation
</span><span>Next you will solve the second equation for y</span>
the smallest number is 0.015 because when you are looking at decimals the first number after the point is the largest number of the decimal places. Hope this helps
Answer:
D. 1 and 20
Step-by-step explanation:
To solve the equation, factor the quadratic and set the factors equal to 0.
d^2 - 21d + 20 becomes (d-20)(d-1) since -1*-20 = 20 and -1+-20 = -21.
Set each equal to 0 and solve for x.
d-20 = 0 d = 20
d - 1 = 0 d = 1
8 books will be on each shelf. There will be 4 shelves for the mystery books and 7 shelves for the biography books.