Question

solve for x: 3x - 7 + 4x = 42

Answer 1

combine like terms on the left side;
add 7 to both sides;
then divide by the coefficient of x to both sides.

Answer 2

still need help?

Answer 3

I'm trying to get this. can you show work and all steps

Answer 4

what you got when you combine 3x + 4x?

Answer 5

3apples + 4apples = ???

Answer 6

7x

Answer 7

ok.. what you did is combine like terms on the left side.

now your equation looks like this:

7x - 7 = 42

Answer 8

ok

Answer 9

the next step is to add 7 to both sides of the equal sign... what u got now?

Answer 10

14 = 49

Answer 11

the right side is correct.. but the left side isn't...

Answer 12

here's the left side

Answer 13

7x-7+7

Answer 14

so the left gots to be 0.

Answer 15

7apples - 7 + 7 = ???

Answer 16

7

Answer 17

lemme put it this way..

Answer 18

using associative property...

Answer 19

7x - 7 + 7
7x + (-7 + 7)
can you simplify what's in the parenthesis?

Answer 20

-14

Answer 21

so it should be 0.

Answer 22

If you owe 7 pennies and somebody gives you 7 pennies. How many pennies do you have?

Answer 23

none

Answer 24

Yes 0!

Answer 25

thats what I said befor but I was erong

Answer 26

But you still have 7x on the left side of your = sign

Answer 27

what did you have on the right side of the = sign?

Answer 28

7x=?

Answer 29

49

Answer 30

7x=49
7x is like saying 7 times x
divide both sides by 7 now

Answer 31

x=?

Answer 32

can 7/ into 49

Answer 33

yes

Answer 34

its 7
x=7

Answer 35

yes

Answer 36

wow I did it.. thank you very much

Answer 37

No problem! Good job!

Answer 38

how about this one? 4x - 5 = x + 13

Answer 39

You need to get x on only one side of the = sign

Answer 40

start by subtracting x from both sides. What will that leave you with?

Answer 41

so I should have 3x

Answer 42

Yep...
3x.....what?

Answer 43

3x -5 = 13

Answer 44

Good....since 5 is negative you need to add 5 to both sides now

Answer 45

3x = 18

Answer 46

yep...what do you think you should do now to figure out x?

Answer 47

/ 3 on each side

Answer 48

Yep! You're good to go now!

Answer 49

x = 6

Answer 50

Exactly

Answer 51

your awesome, I'm glad you took the time to teach me a few things

Answer 52

Thanks! Hope it helped!

Answer 53

it sure did, but I have another problem I did not understand

Answer 54

Okay

Answer 55

7( x + 2) + 3 ( x - 3) = 25

Answer 56

Okay...do you know how to distribute?

Answer 57

nope

Answer 58

So lets just work with the first part of the equation: 7(x+2)

Answer 59

You want to "distribute" the 7 into the parenthesis

Answer 60

7x +2

Answer 61

7x is right, but what about the 2?

Answer 62

or should it be 7x + 14

Answer 63

Yes! 7x + 14!

Answer 64

and I do the same with 3( x - 3)

Answer 65

Now lets work with the second part of the equation: 3(x-3)

Answer 66

Yes...do the same

Answer 67

7x + 14 + 3x - 9 = 25

Answer 68

Yes!
7x +14 + 3x - 9= 25
Let's clean up the left side now.
if you combine the x factors and the numbers what do you get?

Answer 69

10x + 14 - 9 = 25

Answer 70

yes...but what is 14 - 9?

Answer 71

lol, idk I though it had to be in there

Answer 72

10x + 5 = 25

Answer 73

Yep! How do we get 10x by itself on the left of the = sign?

Answer 74

-5 on both sides

Answer 75

Good! Do that :)

Answer 76

ok so my answer should be x = 2

Answer 77

Yes :)

Answer 78

once again we did it

Answer 79

Good job

Answer 80

now it time for graphs for me

Answer 81

Good luck! I really dislike graphing. :)

Answer 82

Gotta go

Answer 83

ok thanks later