figure out the mystery question

[acrca]

to tell you the truth i cannot figure out this math hw so it would be nice if you can post answers: solve each inequality for y:
A. 84x+7y is bigger than or equal to 70
B. 4.8x-0.12y<7.2
just those 4 now....

acrca Reviewed by acrca on 03-05-2006. figure out the mystery question to tell you the truth i cannot figure out this math hw so it would be nice if you can post answers: solve each inequality for y: A. 84x+7y is bigger than or equal to 70 B. 4.8x-0.12y<7.2 just those 4 now.... Rating: 5

[slipknotpsycho]

to tell you the truth i cannot figure out this math hw so it would be nice if you can post answers: solve each inequality for y:
A. 84x+7y is bigger than or equal to 70
B. 4.8x-0.12y<7.2
just those 4 now....

umm.. technically either answer could have a whole range of multitude of answers... it's not like there's only certain numbers that could fit in the variables to complete the equation...

[acrca]

the book says solve the inequality for y, so there is only 1 answer- i know its hard

[slipknotpsycho]

A. 84x+7y is bigger than or equal to 70
in example to my post...

(84 x .50 = 42) + (7 x 4 = 28) = 70...
or..
(84 x 1 = 84) + (7 x -2 = -14) = 70...
or....
(84 x .60 = 50.4) + (7 x 4.5 = 31.5) = 81.9

i could just keep going on and on, i was just trying to give you an idea...

[acrca]

thats 84 X, not times. this is algebra

[benagain]

Yea but 84x would be 84 times another number....right? I dunno. I suck at math.

[da haze meister]

what it means is to put the answer in terms of y... as in just make it y is greater than or equal to whatever. for instance.
20x+4y ≥ 40
-20x from each side
4y ≥ 40-20x
everything divided by four
y ≥ 10-5x
theres your answer for that

[slipknotpsycho]

Yea but 84x would be 84 times another number....right? I dunno. I suck at math.

no you're right, when a variable (letter) is next to a number in an equation, like right up beside it, it's multiplied... been a while since i've been in school.. but i know i haven't smoked myself that stupid yet....

and are you sure there isn't some set numbers you have to choose from to fit in the equation... like i said it's been a long time but i'm pretty sure i know wtf i'm talking about....

[da haze meister]

A. 84x+7y is bigger than or equal to 70
B. 4.8x-0.12y<7.2
just those 4 now....

84x + 7y ≥ 70
everything over 7
12x + y ≥ 10
subtract 12x from both sides
y ≥ 10 - 12x
pwnt
the next is
4.8x - 0.12y < 7.2
multiply everything by 100
480x - 12y < 720
subtract 480x
-12y < 720 - 480x
divide by -12, inequality sign flips
y > 40x - 60
done

[acrca]

yo thanx for the answer haze miester- ur pretty smart. what math r u in?