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tiny-mole [99]
3 years ago
6

Please help who is GOOD at math?!?!?!

Mathematics
2 answers:
Debora [2.8K]3 years ago
4 0
3x+6y=12
-3x -3x
6y=-3x+12
*divide by 6 on both sides*
y= -1/2x+2
Slope: -1/2
Y-intercept: 2
Anit [1.1K]3 years ago
4 0
The equation, in slope-intercept form; that is, "y = mx + b" ;   is:
______________________________________________________
                     y = (-1/2)x + 2 ;
__________________________________________________________

The slope, "m" = -(1/2)  

The y-intercept, "b" = 2 ; that is, "(0, 2)" .
___________________________________________________
Explanation:
______________________________________
Given the linear equation: " 3x + 6y = 12 ";  which is written in "standard form"; that is:  "Ax + By = C" ;  

Rewrite the equation in "slope-intercept format";  or:  " y = mx + b " ;
    in which "y" is isolated as a "single variable" on the "left hand side";  
                 "m" is the coefficient of "x" ; and "m" = the slope of the line;  and
                 "b" is the "y-intercept" of the graph;  
               (that is, the coordinates of the "y-intercept of the graph are:  "(0, b)" .__________________________________________________
Given:  <span>3x + 6y = 12</span>   ; Subtract "3x" from EACH side of the equation:
__________________________________________________
    3x + 6y − 3x = 12 <span>− 3x ;  
</span>
to get: 6y = 12 − 3x ; ↔ Rewrite as:  6y = -3x +12 ;
<span>__________________________________________
Now, divide EACH side of the equation by "6"; to isolate "y" on the "left-hand side" of the equation; and to rewrite the equation in "slope-intercept format" ;
_________________________________________________________
</span>6y / 6 = [-3x +12] / 6 ;

to get:

y = (-3/6)x + (12/6) ;  

↔ y = (-1/2)x +2
 
The slope, "m", is -(1/2);  The y-intercept is "2";  (0,2) .
                       
____________________________________________
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