#### Тема: Solving Inequalities by addition and subtraction Word Problem?

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Try a workout of 10 problems. If you get at least 8 correct on your first attempt, then you''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''re ready to move on. If not, review In Depth and try again.

Can you find all the number fact families? Just the thing for learning the relationship between addition/subtraction and multiplication/division.

Can you meet the challenge to see how many subtraction calculations you can do in two minutes? There are different levels and you can choose either one or two missing numbers to make your number sentence correct.

Try a workout of 10 problems. If you get at least 8 correct on your first attempt, then you're ready to move on. If not, review In Depth and try again.

Positive+positive=positive Negative+positive= (subtract and use the sign of the larger number) Example: -2+10= 8. Negative+negative=negative. When subtracting, before you do anything, ALWAYS change the problem to addition and also change the sign that follows to its opposite. Example: -2-(-3)=? Change to: -2+3 (then use the rules for addition that are stated previously in the answer). So -2+3= 1 I m going to go ahead and tell you multiplying and dividing for you will need this also. Negative X positive= negative. Negative X negative= positive Positive X positive= positive. For multiply, if they have equal signs it s positive. If they have different signs, negative. Now dividing, is the same exact thing. Example: 4 dividedby 2= 2 (positive) -4 dividedby 2= -2 -4 dividedby -2= 2 4X4=16 -4X4=-16 -4X(-4)=16 HOPE THIS HELPED!!!!!

Try a workout of 10 problems. If you get at least 8 correct on your first attempt, then you''''re ready to move on. If not, review In Depth and try again.

Can you find all the number fact families? Just the thing for learning the relationship between addition/subtraction and multiplication/division.

Can you meet the challenge to see how many subtraction calculations you can do in two minutes? There are different levels and you can choose either one or two missing numbers to make your number sentence correct.

Try a workout of 10 problems. If you get at least 8 correct on your first attempt, then you''re ready to move on. If not, review In Depth and try again.

These are simultaneous equations so we need to try and eliminate one of the variables by making the coefficient of either a or b the same and then they can be subtracted. Here we go. 3a+4b=2 (multiply everything in this row times 4) 4a-4b=12 (multiply everything in this row times 3) That makes 12a + 16b = 8 12a - 12b = 36 Now subtract the second equation from the first.(Be careful of the negative sign!!) the 12a s are gone and 16b - - 12b becomes 28b since a double negative makes it positive, right? 8 - 36 makes -28 Now we have 28b = -28 Divide both sides by 28 and we have b = -1 Now choose an equation and replace the -1 in place of a b and solve 3a + 4(-1) = 2 3a -4 = 2 add 4 to both sides (since the 4 is subtracted from 3a) 3a = 6 Divide both sides by 3 (since division is the opposite of multiplying) a = 2 It doesn t matter which of the variables is eliminated, the problem will work out either way. Hope this helps.

Try a workout of 10 problems. If you get at least 8 correct on your first attempt, then you''''''''re ready to move on. If not, review In Depth and try again.

Can you find all the number fact families? Just the thing for learning the relationship between addition/subtraction and multiplication/division.

Can you meet the challenge to see how many subtraction calculations you can do in two minutes? There are different levels and you can choose either one or two missing numbers to make your number sentence correct.

Try a workout of 10 problems. If you get at least 8 correct on your first attempt, then you''''''''''''''''re ready to move on. If not, review In Depth and try again.

Can you find all the number fact families? Just the thing for learning the relationship between addition/subtraction and multiplication/division.

Can you meet the challenge to see how many subtraction calculations you can do in two minutes? There are different levels and you can choose either one or two missing numbers to make your number sentence correct.