Tuesday

July 22, 2014

July 22, 2014

Posted by **B.B.** on Monday, March 1, 2010 at 4:59pm.

Solve using the multiplication principle. Give the answer in set-builder notation.

-4/5 less than or equal to -8x.

I want to say that I multiply both sides by 5 but I'm not sure. I'm confused with this problem.

Thanks.

- Math -
**bobpursley**, Monday, March 1, 2010 at 5:08pmyou are trying to solve for x. How does multiplying by 5 do that? Why not start by multiplying by 1/8? You do have one more step.

- Math -
**Reiny**, Monday, March 1, 2010 at 5:08pmgo with your instinct

-4/5 ≤ -8x

times by +5

-4 ≤ -8x

"move" the terms

8x ≤ 4

divide by 8

x ≤ 1/2

remember you switch the inequality sign only if you multiply or divide the inequation by a negative, we multiplied by +8, so it stayed the same.

- ooooppss Math -
**Reiny**, Monday, March 1, 2010 at 5:11pmforgot to multiply the right side by 5

-4 ≤ -40x

40x ≤ 4

x ≤ 1/10

- Math -
**B.B.**, Monday, March 1, 2010 at 6:32pmThanks.

**Related Questions**

math - solve using set builder notation -8-11(3x+7)less than or equal to -40x-9

Math-geometry - I do not understand set-builder notation..... Using correct ...

algebra - Q: when graphing the equation y = 4/3x + 2, the y intercept is? A: (0,...

Math (Algebra) - Solve using the multiplication principle -7x <_ 35 the sign ...

Math - Solve by using the multiplication principle -2x> 1 over 9 I have tried...

Math equation - solve using the addition and multiplication principle 5x+2-4 ...

math equation - solve using the addition and multiplication principle 5x+2-4x is...

Hard math - Solve by using the multiplication principle -2x> 1 over 9 I have ...

math - Can someone please check my answers? Thank you! 1. is (-8,-9) a solution ...

math - Solve -3(x-10)>-x+5. Write your solution using set builder notation. ...