+0  
 
+6
238
3
avatar

If    7X + 3 = 5X – 7, evaluate:   4 + 2X – 2.

Guest Sep 26, 2014

Best Answer 

 #3
avatar+91469 
+11

You do not need to work out what x is!

 

If    7X + 3 = 5X – 7, evaluate:   4 + 2X – 2.

 

evaluate:     4+2X-2 = 2X+2

 

7X+3=5X-7

2X+2+1=-7

2X+2=-8

Melody  Sep 26, 2014
Sort: 

3+0 Answers

 #1
avatar+238 
+11

2x=-10

x=-5

4+2x-2=2+2x=2+2*(-5)=2-10=-8

quinn  Sep 26, 2014
 #2
avatar+148 
+6

7x+3=5x-7

3+(-7) = -4

7x-5x=2x

2x=-4

x=-2

 

$${\mathtt{4}}{\mathtt{\,\small\textbf+\,}}{\mathtt{2}}{\mathtt{\,\times\,}}\left(-{\mathtt{2}}\right){\mathtt{\,-\,}}{\mathtt{2}} = -{\mathtt{2}}$$

Coolkille98  Sep 26, 2014
 #3
avatar+91469 
+11
Best Answer

You do not need to work out what x is!

 

If    7X + 3 = 5X – 7, evaluate:   4 + 2X – 2.

 

evaluate:     4+2X-2 = 2X+2

 

7X+3=5X-7

2X+2+1=-7

2X+2=-8

Melody  Sep 26, 2014

18 Online Users

avatar
We use cookies to personalise content and ads, to provide social media features and to analyse our traffic. We also share information about your use of our site with our social media, advertising and analytics partners.  See details