Flip the sign when you multiply or divide both sides by a negative number.
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http://www.mathsisfun.com/algebra/inequality-solving.html
You do not need to flip the inequality sign when solving the inequality -3t + 7 ≥ 9. TRUE or FALSE?
I'm not that great at knowing when to flip inequality signs... Can someone help me ASAP?
Thank you for your assistance in advance.
Nic
5 answers
Usually you do not have to worry about flipping until the last step, or until you have isolated the variable term on one side
e.g.
-3t + 7 ≥ 9
-3t ≥ 9-7
-3t ≥ 2
now we care about it.
Whenever you multiply or divide by a negative number, we have to switch the direction of the inequality sign
so to get t all alone, we have to divide by -3 , thus
t ≤ -2/3
e.g.
-3t + 7 ≥ 9
-3t ≥ 9-7
-3t ≥ 2
now we care about it.
Whenever you multiply or divide by a negative number, we have to switch the direction of the inequality sign
so to get t all alone, we have to divide by -3 , thus
t ≤ -2/3
Thanks Ms. Sue and Reiny!
You are welcome.
Thanks to you both 4 helping me!