inequalities (graphing + solving them): 7 probs  TOPIC_SOLVED

Simplificatation, evaluation, linear equations, linear graphs, linear inequalities, basic word problems, etc.

inequalities (graphing + solving them): 7 probs

Postby ignort767 on Thu Dec 01, 2011 1:38 am

We are working on inequalities (graphing solving and absolute value), and coin problems and i am having a lot of trouble with both of them, i have been studying a lot, but still dont quite get them and we have a test on friday! :shock:
if there is anyway you can help by tips, or showing me were to get good practice problems, that would really help me
we are doing problems like these:

1: -5x+3>8 or 2x - 6 >4 solve it and graph it

2: {x:-2+x<4} U {x:3x>12} solve and graph

3: 4x + 31>11-x and 3x - (-x-1) < 7 solve and graph

4: 2Ix+4I > 12 solve and graph

5: 7I3x+5I - 4 I3x+2I = 0 (dont get this one) - i know you usually subtract the 2 absoulte values - but these arent equal!

6: Nick L. has a pockatful of nickels, dimes, and quarters. He has 4 more nickels then quarters and 4 more dimes than nickels. The total value of all hi coins is $6.60 How many of each coin does he have?

Also every so often we have these

7: find all value of x for which the perimeter of the rectangle is less then 18
base = 2x-3
height= x-2

THANKS! :clap:
ignort767
 
Posts: 1
Joined: Thu Dec 01, 2011 1:21 am

Sponsor

Sponsor
 

Re: inequalities (graphing + solving them): 7 probs  TOPIC_SOLVED

Postby little_dragon on Fri Dec 02, 2011 3:56 pm

ignort767 wrote:if there is anyway you can help by tips, or showing me were to get good practice problems, that would really help me

there R loads of worked examples on this site!

ignort767 wrote:1: -5x+3>8 or 2x - 6 >4 solve it and graph it

2: {x:-2+x<4} U {x:3x>12} solve and graph

3: 4x + 31>11-x and 3x - (-x-1) < 7 solve and graph

to learn how go here: http://www.purplemath.com/modules/ineqlin.htm

ignort767 wrote:4: 2Ix+4I > 12 solve and graph

to lear how try here: http://www.purplemath.com/modules/absineq.htm

ignort767 wrote:5: 7I3x+5I - 4 I3x+2I = 0 (dont get this one) - i know you usually subtract the 2 absoulte values - but these arent equal!

try here http://www.purplemath.com/modules/solveabs.htm

ignort767 wrote:6: Nick L. has a pockatful of nickels, dimes, and quarters. He has 4 more nickels then quarters and 4 more dimes than nickels. The total value of all hi coins is $6.60 How many of each coin does he have?

go here http://www.purplemath.com/modules/coinprob.htm

ignort767 wrote:7: find all value of x for which the perimeter of the rectangle is less then 18
base = 2x-3
height= x-2

plug the "base" and "height" into the formula 4 the perimeter of a rectangle & set up [perimeter] < 18 & solve

plz rite back if U get stuck
:wave:
User avatar
little_dragon
 
Posts: 184
Joined: Mon Dec 08, 2008 5:18 pm


Return to Beginning Algebra