Question

Proof Help? Please?

Answer 1

Given: 3x + 1 = 2 + 2x – 4

Prove: x = –3

Given the equation 3x + 1 = 2 + 2x – 4, use the commutative property to rearrange the terms so that like terms are next to one another. This gives the equation 3x + 1 = 2 – 4 + 2x. Then use the associative property of addition to group the like terms. This gives the equation 3x + 1 = (2 – 4) + 2x. Next, combine like terms to get the equation 3x + 1 = – 2 + 2x. Use the subtraction property of equality to subtract 2x from both sides of the equation. This gives the equation x + 1 = – 2. Then use the _________________________ to subtract 1 from both sides of the equation. This gives the solution x = –3. Therefore, given the equation 3x + 1 = 2 + 2x – 4, x is equal to –3.

Which justification was left out of the paragraph proof above?

Answer 2

I feel like it would be Subtraction Property of Equality of Addition Property of Equality? Are either of them right? Or am I completely wrong?

Answer 3

Do you have a Subtraction Property of Equality? If so, then that's the one :)

Answer 4

Are you sure? It was used directly before the last step :o

Answer 5

Yeah, I'm sure :)
Those were two different instantiations of the Subtraction Property of Equality.

(lol big words :3 )

Answer 6

Hahahaha, okay. I'm trusting in you. <3 thank you so much!

Answer 7

Trusting in me?
It has been widely said that that's a bad idea :>

Answer 8

Your freaking Peter Pan. Wendy trusted you to fly over the Big Ben. I think I can trust you with some school work. ;D

Answer 9

^.^