rootbeer003:
help
rootbeer003:
@satellite73
satellite73:
if you put \(x\) equal the hours, and \(y\) as the cost, then at the current rate the cost in terms of hours is \[y=4x+6\] at the increased rate it would be \[y=5x+10\]
rootbeer003:
mk
satellite73:
for 6 hours at the current rate it would cost \[y=4\times 6+6=24+6=60\] so \(\$30\) at the increased rate it would be \[y=5\times 6+10=30+10=40\] so \(\$40\)
rootbeer003:
ok
rootbeer003:
is that a and b
satellite73:
yes, A and B both parts
rootbeer003:
ok
satellite73:
C increase from \(\$30\) to \(\$40\) is \(\$10\) as a percent of the original cost \(10\div30=\frac{1}{3}=33\tfrac{1}{3}\%\)
satellite73:
that was C in case you were wondering
rootbeer003:
mhm
satellite73:
D if he paid \(\$42\) the original rate, you have \[4x+6=42\] subtract 6 get \[4x=36\] divide by 4 get \[x=9\] he rode for nine hours
satellite73:
that was D
rootbeer003:
Ok next?
satellite73:
\[3x+5y=-9\\ 2x+y=-34\] substitution might be easiest the second equation \(2x+y=-34\) is the same as \(y=-2x-34\) substitute that in the first equation for \(y\) get \[3x+5(-2x-34)=-9\]
satellite73:
to solve that, first distribute \[3x-10x-170=-9\] combine like terms get \[-7x-170=-9\] add \(170\) get \(-7x=161\) divide by \(-7\) get \(x=-23\)
satellite73:
then substitute \(x=-23\) in either of the original equations, for example in \[y=-2x-34\] get \[y=-2\times 23-34=12\] so the solution is \[x=-23,y=12\] or as an ordered pair \[(-23,12)\]
rootbeer003:
ok
satellite73:
typo there, should be \[y=-2\times (-23)-34=12\]
satellite73:
i hope you have some part before that, like how you got the \(x=-23\)
rootbeer003:
lol
rootbeer003:
looks good?
satellite73:
yes, looks excellent, since i wrote it
rootbeer003:
ya
rootbeer003:
ok graph now?
rootbeer003:
what shall i do
satellite73:
graph it, i can't do it for you you have two lines to graph you have to do it. i can help, hold on one second i have to answer an email
rootbeer003:
can i use desmo graph
rootbeer003:
or u can tell me what it suposed to look like
satellite73:
you can use desmos
satellite73:
the two lines will intersect at \((-23,12)\)
rootbeer003:
okie dokie
rootbeer003:
wait what do i type into desmo
satellite73:
i don't know, i never use it
rootbeer003:
ok then on wolf
satellite73:
i did it, it worked fine
satellite73:
in demsos type in \[3x+5y=-9\] on the upper left, then go to the next box down and type in \[2x+y=-34\]
rootbeer003:
mine should look exaclty like dat
satellite73:
scroll in so that it goes from -36 to 36 like your graph paper make sure they intersect at the point \((-23,12)\) yes, it should look like dat
rootbeer003:
dont have to be perf
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 \[8x+12y=171\]
rootbeer003:
how does my graph look
satellite73:
ugly the lines are supposed to be straight
rootbeer003:
no one perfect
satellite73:
no, that is for sure
rootbeer003:
lol but they are OKAY?
satellite73:
yes good enuf
rootbeer003:
ok is that all for the 2nd one?
satellite73:
yes
satellite73:
hold the phone
satellite73:
we are not done with the pet store
rootbeer003:
o okkkkk
rootbeer003:
well i asked
satellite73:
\[10x+12y=152.50\\ 8x+12y=171\] we need so solve
satellite73:
typo \[10x+8y=152.50\\ 8x+12y=171\]
satellite73:
multiply the first equation by \(-3\) and the second equation by (2\) and you get \[-30x-24y=-457.50\\ 16x+24y=242\]
rootbeer003:
I hope there arnt from yahoo answers. i could get in trouble
satellite73:
i think i made a mistake somewhere
rootbeer003:
ARE they?
satellite73:
are they what?
rootbeer003:
Are these answers of yahoo answers?
rootbeer003:
off
satellite73:
lol hell no here solve \[10x+8y=152.50\\ 8x+12y=171\] you get \[x=8.25, y=8. 75\] so \(\$8.25\) at the movies, \(\$8.75\) at the pet store
satellite73:
don't ask how to solve it, i used wolfram next...
satellite73:
make a new thread
rootbeer003:
is that it for this one?
Join our real-time social learning platform and learn together with your friends!
Bounty:
guys I'm losing all my motivation for school work how can I motivate myself to stop being lazy because even while I'm being on my work it still piles up and
albert14ring:
Can you give me suggestions on the fastest and most organized way to be ready early in the morning to go to school without any confusion or delay? The impor
Twaylor:
how to make good breakfast food ingredients : 1 mother flat bread bananas peanut
lovelove1700:
u00bfA quu00e9 hora es tu clase?Fill in the blanks Activity unlimited attempts left Completa.
glomore600:
find someone says that that one person your talking to doesn't really like you should I take their advice and leave or should I ask the person i'm talking t
Addif9911:
Him I dimmed the light that once felt mine, a glow I never meant to lose. I over-read the shadows, let voices crowd the room where only two hearts shouldu20
EdwinJsHispanic:
Poem to my mom who proved my point "You proved my point, I am a failure. but I kinda wish, you were my savior.