M
The inverse of addition is ...
subtraction
The inverse of multiplication is.....
Division
The inverse of subtraction is ......
addition
The inverse of division is .....
multiplication
20 = 4x
x=5
13= x -7
x=20
90= x + 15
x = 75
x/5=7
x=35
-7x=49
x=-7
-4x= -32
x = 8
x/-8 = 7
x = -56
x/11 = -3
x= -33
same signs ______, different signs _______
add, subtract
How do you know if the answer to x+5=-9 will be positive or negative?
when you subtract the 5, you will have same signs so keep the negative sign
-8 + x = -55
x = -47
19 = -12 + x
x=31
-15x = 15
x = -1
-52+x=-24
x=-28
how do you know when the answer to a * or / problem will be + or - ?
Look at how many negatives you start with
how do you know if the answer to -15+x=-6 will be positive or negative?
when you move the -15 by adding, you have -6 +15 and that's different signs subtract, use the sign of the larger number