Answer:
I love math anyways
The ans is in the picture with the steps how i got it
(hope it helps i plz have brainlist :D hehe)
step-by-step explanation:
Answer:
fred = 45 books
sally has 27 times more book than fred
sally = 45 X 27
= 1215 books
<span>3•(x•y)=(3•x)•y
</span>
answer
associative property of multiplication
Answer: Choice C) -11
-----------------------------------
Explanation:
The first equation given is y = 3 - 1/2x
In other words, y is the same as 3 - 1/2x.
We can replace y in the second equation with 3 - 1/2x
This is known as substitution (think of a substitute teacher who is a temporary replacement for your teacher)
Doing this leads to...
3x+4y = 1
3x+4*y = 1
3x+4*( y ) = 1
3x+4*( 3 - 1/2x ) = 1 <<--- y has been replaced with 3-1/2x
3x+4*(3) +4*(-1/2x) = 1
3x+12-2x = 1
3x-2x+12 = 1
x+12 = 1
x+12-12 = 1-12 <<-- subtracting 12 from both sides
x = -11
Which is why the answer is choice C) -11
