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katrin2010 [14]
3 years ago
12

Solve the following equation: -7x = 42

Mathematics
2 answers:
Andreyy893 years ago
8 0
1. x = -7
2. x = -2
3. x = 3
aleksley [76]3 years ago
5 0
Answers:
__________________________________________________________
   1)    " x = -6 "  .
_____________________
   2)  " x = 8 " .
_____________________
   3)   " x = 3 " .
__________________________________________________________
___________________________________
 
Explanation:
___________________________________
  1)   "  -7x  =  42 " ;  Solve for "x" ;  

Divide each side by "-7" ; 

-7x / -7 = 42/ -7 ; 

  x = - 6 .
____________________________________

2)   " 2(x − 4) <span>− 15  =  - 7 " ;  Solve for "x" ; 

     Add "15" to each side of the equation ; 

      " </span>2(x − 4) − 15 + 15  =  - 7  + 15 ; 

  → " 2(x − 4) = 8 "  ;

Now, divide each side of the equation by "2" ; 

      →    [ 2(x − 4) ] / 2  =  8 / 2 ;

 to get:  "(x − 4) = 4 " ; 

Add "4" to each side of the equation; 
 to isolate "x" on one side of the equation; and to solve for "x" ; 

     →  x − 4 + 4 = 4 + 4 ;

to get:    " x = 8 " .
______________________________________________________

3)  "6x  − 2  = 4(x  +  1 ) "

   →  Factor out a "2" from "6x  − 2" :

   →  " 2(3x  −  1) " ;

Rewrite the equation as:

   →  " 2(3x  −  1)  = 4(x  +  1) '" ; 

Now, divide EACH SIDE of the equation by "2" ; 

   →  " [ 2(3x  −  1) ] / 2  =  [ 4(x + 1) ] / 2 " ;

to get:

   →  3x − 1  = 2(x + 1) .
___________________________
Now, let us simplify the "right-hand side" of the equation ; 

Note the "distributive property of multiplication" :

a (b + c)  = ab + ac ;
____________________________________________
  As such:  " 2(x + 1) =  (2*x) + (2*1`) = 2x + 2 ; 

Now, rewrite the equation:


   →  " 3x − 1   =  2x + 2 " ;

Subtract "2x" from each side of the equation; & Add "1" to each side of the equation:
 
  →  " 3x  − 1  − 2x + 1  =  2x + 2  −  2x + 1 ; 

to get: 

x  = 3 . 
___________________________________________________
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7 0
3 years ago
HELPPPPPPPPPPPPPPPPPPPP
Gnesinka [82]
A.
the y intercept is where x=0
x represents the number of months
when the number of months is 0, that is the initial number of games won

that looks to be a little below y=2, so maybe y=1.8?
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B.
we can use y=mx+b
m=slope
b=y intercept
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find the slope
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the I'm going from x=0 to x=10
the rise is about 18.95 (from 1.8 to 20.75)
the run is 10
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the equation would be y=1.895x+1.8
the points were (0,1.8) and (10,20.75)
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