# Algebra

posted by Dean

"Do the two inequalities have the same solutions? Wriet yes or no.

-5x > 0
x > 0

Solve each inequality and ch eck your solution.

9x > 81

-thanks

1. CL

-5x > 0
-5x/-5 > 0/-5
x < 0 since we are dividing by a negative, the inequality changes
so, no the answer is not the same

9x > 81
x > 81/9
x > 9

2. Do

first one no:
when dividing by a negative you need to flip the inequality sign
-5x > 0 = x < 0
x<0 doesn't equal x>0

the second
x> 81/9
x> 9

3. Anonymous

A 3-mi cab ride costs \$3.00. A 6-mi cab ride costs \$4.80. Find a linear equation that models cost c as a function of distance d.

4. Do

you should have posted as a new question

5. Dean

Can you help me on this problem as well? (or anyone.)

Solve each inequality and check your solution.

h
- > -7
4

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