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

Guest Sep 26, 2014

Best Answer 

 #3
avatar+93289 
+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
 #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+93289 
+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

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