Question

Solve the equation.

78 = -2(m + 3) + m

Answer 1

please explain..

Answer 2

Use PEMDAS (Parenthesis, Exponents, multiplication, division, addition, subtraction)

We have parenthesis, but (m + 3) cannot be solved because they are not liket erms
We have no exponents
There is some multiplication we can do. We can distribute 2

78 = -2(m + 3) + m
78 = -2m - 3 + m

Now we move onto addition/subtraction. We see we can add -2m and m because they are like terms

78 = -1m - 3

Now, we need to perform the opposite operation to isolate -m. That is, by adding 3 to both sides

78 + 3 = -1m
81 = -1m

Now we simply divide by -1. So 81/-1 = ??

Answer 3

A. – 28
B. – 42
C. – 72
D. – 84

Answer 4

78 = -2(m + 3) + m
78 = -2m -6 +m
78 = -m -6
84 = -m
m = -84

Answer 5

@wolf1728 i did it like you, but how did you get the 84?

Answer 6

oh you i see , you added 6. nevermind. lol thankyouuu

Answer 7

Adding +6 to both sides - oh you see? okay

Answer 8

thanks

Answer 9

u r welcome