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svet-max [94.6K]
2 years ago
12

X = 3y - 6 2x - 4y = 8 Solve the system of equations using substitution.

Mathematics
2 answers:
velikii [3]2 years ago
4 0
Equation 1)  x = 3y - 6
Equation 2)  2x - 4y - 8

Basically, for equation 1, you would move the 3y to the other side so that x and y are on the same side. However, because it is a positive, when moving it over, it becomes a negative.

1)  x - 3y = -6
2)  2x - 4y = 8

Multiply ALL of equation 1 by 2 so that you could find the value of y.

1)  2(x - 3y = -6)

1)  2x - 6y = -12
2)  2x - 4y = 8

Subtract equations :)

-2y = -20

Divide both sides of the equation by -2, so that y is isolated.

y = -20/-2

y = 10

Plug in 10 for y in the first equation :)

x = 3y - 6

x = 3(10) - 6

Simplify.

x = 30 - 6

Simplify.

x = 24

So, x = 24, and y = 10

~Hope I helped!~
EleoNora [17]2 years ago
3 0
X = 3y - 6 so:
2(3y - 6) - 4y = 8
6y - 12 - 4y = 8
2y - 12 = 8
2y = 20
y = 10

x = 3(10) - 6
x = 30 - 6
x = 24
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What’s the inverse of the function f(x) = 2x - 10
erastovalidia [21]
The answer is:  " f ⁻¹(x)  = \frac{x}{2}  + 5 " . 
____________________________________________________

Explanation:

____________________________________________________

Given the function:  " f(x) = 2x <span>− 10 " ;  Find the "inverse function" .

Let "f(x)" be represented by "y" ; and rewrite:

    y = 2x </span><span>− 10 ; 

Change the "y" to an "x" ;  and change to "x" to a "y" ; as follows:
___________________________________________________
    x = 2y </span><span>− 10 ; 

Now, rewrite this equation, in "slope-intercept form";  that is;  "y = mx + b" ; 

To do this, start by solving THIS equation for "y"; in terms of "x" ; with "y" as an "isolated variable" on the "left-hand side" of the equation; 
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 We have: 
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   " x = 2y </span><span>− 10 " ; 

Add "10" to each side of the equation; as follows:

    x + 10 = 2y </span><span>− 10 + 10 ; 

to get:

     x + 10 = 2y ; 

</span>↔  2y = x + 10 ;
<span>
Now, divide each side of the equation by "2" ; 
       to isolate "y" on one side of the equation (as a single variable); 
       & to solve for "y" ; 

</span>→  2y / 2 = (x + 10) / 2 ; 
<span>
to get: 

</span>→    y = (x/2)  + (10/2) ; 

→    y = (x/2) + 5 ; 
<span>
Now, rewrite the equation, by substituting:  " f </span>⁻¹(x) " ;  in place of the "y" ;                     to indicate that this function is an "inverse function; as follows:
 
→   " f ⁻¹(x)  = \frac{x}{2}  + 5 " . 
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The answer is:  " f ⁻¹(x)  = \frac{x}{2}  + 5 " . 
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Lets solve the question,

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concrete walkway with width = c

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