Posted by Anonymous on Tuesday, March 18, 2014 at 8:25pm.
-9=6+a
Subtract 6 from both sides.
Ms. Sue is correct, but we could also take the additon sign and switch it to subtraction. If I had the numbers 14-7=7 I switch it to addition (the opposite) and say 7+7 is 14. That is basically what we are doing here. Lets take -9=6+a. Now -9-6=a. When adding, we need to take the number it is equal to and get the other (known) number and subtract it by that. Since we have one negative it is adding 9 and 6. That is 15. Just remember this chant. It is in the tune of sound off.
When you multiply or divide
just keep in mind this basic rule
same sign is positive
different sign is negative
then for adding and subtracting. You can take addings place and simply say subtracting.
When your adding intigers
Find the sum if the signs are the same
but if the signs are different
you need to find the difference.
^^^^ Same with subtracting.
Thank you guys so much! Especially Pride! Thank u for putting so much time and effort on teaching us!