Question

can someone please help me and show me how to do this please ;"(

Simplify and solve this equation: 4m + 9 + 5m – 12 = 42.

A. m = 5
B. m = 4
C. m = –5
D. m = -4

Answer 1

So the way it works is you have to plug it in. so start with 4. 16+9+20-12
that is 45-12 which is 33. So no. 5 would be 20 + 9 + 25 - 12 which is 42! So the answer is 5. Just remember, plug in the numbers, and everything would be great! Lmk if you need anything else

Answer 2

were did you get this from 4. 16+9+20-12?

Answer 3

what happened to this 4m + 9 + 5m – 12 = 42.

Answer 4

so it is 4m so that is 4x4 which is 16. And 5m would be 5 x 4 which is 20

Answer 5

I just plugged in the #s. Sorry!

Answer 6

4m + 9 + 5m – 12 = 42. that is the base. so 4m = 4 x the #, so you replace 4m with the answer

Answer 7

I'm really sorry. i don't understand :(.

Answer 8

Ok, so 4m is 4 times of the variable. So m is the variable. So what you are doing is that you replace the variable with the number, so 4m would be 4 x 4 if you are replacing m with 4. So m would be 5 if you use 5 as the variable. And hey, it is fine!

Answer 9

thank you :'). so how is 4m 4x4 but 5m is not 5x5

Answer 10

I am using 4m as an example from the problem! so up there, there is 4m and 5m. So if m=5 then there would be 4 x 5 and 5 x 5 because it is 4m/5m. The 4/5m means that you are multiplying the number times the variable

Answer 11

Do you understand or no? Please let me know!

Answer 12

so what do you mean by 4 x 5 and 5 x 5?

Answer 13

im jus trying to understand

Answer 14

so it is 4m which is 4 times the variable. the letter is the variable. So 4x5 is 4m and m=4 so when a variable is connected to the #, that means to multiply it. So when you do 4m it = 4 x4. and so up there, 5m would be 5 times the variable. And since m is the variable, m would = one of the 4 answer choices. Just plug them in, and it would be fine. so 4m = 4 x the variable

Answer 15

LMK if you need more help!

Answer 16

I'm really sorry but i really don't understand at all

Answer 17

Really it is no problem. So tell me, what is it that you don't understand? Is it how the 4m = 4 x the #, or is it the m = a # or? I need to know so I can help!

Answer 18

so it is 4m which is 4 times the variable. the letter is the variable. So 4x5 is 4m and m=4 so when a variable is connected to the #, that means to multiply it. So when you do 4m it = 4 x4. and so up there, 5m would be 5 times the variable. And since m is the variable, m would = one of the 4 answer choices. Just plug them in, and it would be fine. so 4m = 4 x the variable

Answer 19

what i don't understand is the whole entire question and the m thing you talking about. please don't think I'm trolling you or being funny.

Answer 20

@jakyfraze what you said above was absolutely correct! so normally x is the normal variable, but in this case, they are using m. so you do m x the # and then add and subtract the numbers above in the correct order (PEMDAS) and then you get an answer, and if it matches, it is right!

Answer 21

And I don't think you are trolling don't worry!

Answer 22

oh :') thank you. can you please do a step by step on how you got the answer please. i really want to learn this. thank you so much trying to explain it to me :)

Answer 23

Ok! So step one find the variables and such. So that in this case is m. And up there, the answer choices are 4, 5, -4, -5. so what you have to do is replace m with one of the answer choices. So in this case, it is 4m and 5m, so you replace them with 4 x 4,5,-4, or -5. Only one though. So let's use 4. 4m + 9 + 5m – 12 = 42. So replace 4m with 4 x 4 and 5m with 5 x 5. So once you have that, you just solve it. so 16+9+20-12. and that is 33. so let's redo it with 5. 20+9+25-12, and that is 42!

Answer 24

Are you still there?

Answer 25

I guess not! I hope you understand! Have a great day and good luck!

Answer 26

@WoahItsJian sorry i feel asleep :(

Answer 27

@WoahItsJian 5 x 5= 25. you said 20.

Answer 28

@Mehek14 are you good at math?

Answer 29

add like terms

Answer 30

can you explain to me how you would solve this or how to solve it

Answer 31

4m + 5m = 9m
9 - 12 = -3
9m - 3 = 42
add 3
9m = 45
divide by 9
m = 5

Answer 32

@Mehek14 why add three? are suppose to only add the middle to the right side?

Answer 33

you want to get m by itself so you move everything to the other side
when you move something, you do the opposite operation
-3 becomes +3

Answer 34

so you only do this when the number is -3?

Answer 35

@Mehek14 right?

Answer 36

no to anything moving to the other side

Answer 37

what moves to the right side?

Answer 38

like how you had
9m = 45
to get 9 to the other side, you had to do the opposite
9 was being multiplied to m
to move it to the other side, i divided 9

Answer 39

@Mehek14 can you give me a problem to solve please? i want to see if i got it

Answer 40

ok