rootbeer003:
help
rootbeer003:
is that it for that question
satellite73:
i forget
satellite73:
what else was there?
rootbeer003:
looks good?
satellite73:
the first part is right, the middle part is wrong
rootbeer003:
***
rootbeer003:
Put x as the amount of money at the movie theater , and y as the amount of money at the pet store Then the first equation is 10x+8y=152.50 and the second is 8x+12y=171 10x+8y=152.50 8x+12y=171 I then need to solve Multiply the first equation by −3 and the second equation by (2\) and you get −30x−24y=−457.50 16x+24y=242 10x+8y=152.50 8x+12y=171 you get x=8.25,y=8.75 so $8.25 at the movies, $8.75 at the pet store
rootbeer003:
change it up
satellite73:
Put x as the amount of money at the movie theater , and y as the amount of money at the pet store Then the first equation is 10x+8y=152.50 and the second is 8x+12y=171 10x+8y=152.50 8x+12y=171 I then need to solve
satellite73:
multiply the first equation by \(-3\) and and the second equation by 2 get \[-30x-24y=-457.50\\ 16x+24y=342\] add and get \[-14x=-115.5\] divide by 14 get \[x=8.25\]
satellite73:
substitute \(8.25\) in \[8x+12y=171\] get \[8\times 8.25+12y=171\\ 66+12y=171\\ 12y=105\\ y=8.75\]
satellite73:
there is still another part i think
satellite73:
okay still think there s another part to the original question repost it
satellite73:
eyah i thiought so work 6 hours at the pet store, needs $168 solve \[8.75\times 6+8.25x=168\]
rootbeer003:
where that go
satellite73:
second part doe
rootbeer003:
ok next question??
satellite73:
\[8.75\times 6+8.25x\eq 168\\ 52.5+8.25x\geq 168\\ 8.25x\geq 115.5\\ x\geq 14\] he needs to work at least 14 hours at the theater
rootbeer003:
umm
satellite73:
next
rootbeer003:
that is not english
rootbeer003:
wait
satellite73:
\[8.75\times 6+8.25x\geq 168\\ 52.5+8.25x\geq 168\\ 8.25x\geq 115.5\\ x\geq 14\]
rootbeer003:
wheres that go
rootbeer003:
end?
satellite73:
yes, goes at the end
satellite73:
\[f(x)=x^2-2x-3=(x-3)(x+1)\] to ind the x intercepts \[(x-3)(x+1)=0\\ x=3, x=-1\]
satellite73:
to find the y intercept \[f(0)=-3\] y intercept is \((0,-3)\)
satellite73:
first coordinate of the vertex is \[x=-\frac{b}{2a}=-\frac{-2}{2\times 1}=1\] then \[f(1)=1^2-2-3=-4\] vertex it \((1,-4)\)
rootbeer003:
thts all?
satellite73:
make sure to plot the points \((1,-4), (0,-3), (-1,0), (3,0)\)
satellite73:
ooooookay
rootbeer003:
look s good?
satellite73:
yes, good an ugly
rootbeer003:
like me!
rootbeer003:
ok thank you and have a good day
satellite73:
lol, like blondie really? done/
satellite73:
go do something fun, i'll see you later
rootbeer003:
byee
satellite73:
byee
rootbeer003:
wait
rootbeer003:
@satellite73
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