I am able to solve regular inequalities but not this type

2x+1 < 5x-8

Printable View

- Sep 24th 2011, 01:16 PMGaDoomZstuck on an inequality problem
I am able to solve regular inequalities but not this type

2x+1 < 5x-8 - Sep 24th 2011, 01:17 PMSironRe: stuck on an inequality problem
What have you tried?

Put all the constant numbers to one side and also all the variables to one side. Can you do that? - Sep 24th 2011, 01:20 PMGaDoomZRe: stuck on an inequality problem
so 7x+7=0?

or

2x+1-5×-8=0

I tried both and still get stuck - Sep 24th 2011, 01:26 PMPlatoRe: stuck on an inequality problem
- Sep 24th 2011, 02:53 PMfreestarRe: stuck on an inequality problem
Approach inequalities like a regular equation. The only thing you Must keep in mind is to flip the sign whenever you divide by a negative number.

Here's an example:

$\displaystyle -1-5x < -3x + 7$

$\displaystyle -2x < 8$

divide both sides by -2, therefore sign flips.

$\displaystyle x > -4$

Hope it helped. - Sep 24th 2011, 04:43 PMArchie MeadeRe: stuck on an inequality problem
Because you have not taken the correct steps.

$\displaystyle 2x+1<5x-8$

Add 8 to both sides, the left is still less than the right

since 3<7, therefore 3+8<7+8 for example.

$\displaystyle 2x+1+8<5x+8-8$

$\displaystyle 2x+9<5x$

$\displaystyle 5x>2x+9$

Now subtract 2x from both sides.

This gets you to what is probably quite familiar to you.