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OLEGan [10]
3 years ago
10

Solve using substitution. x + 3y = -13 5x + 7y = -9

Mathematics
2 answers:
Zarrin [17]3 years ago
6 0
X+3y=-13
x=-3y-13
5(-3y-13) +7y = -9 
-15y -65 +7y = -9 
-8y-65=-9
             65 -
             -----
             -74
              /-8
             ------
  y=       9.25

x+3(9.25) = -13
x+27.75= -13
             27.75-
             -------
x=        -40.75

ipn [44]3 years ago
6 0
<span>Just add -3y to both of the sides:

x + 3y + -3y = -13 + -3y

x = -3y - 13

Our Answer:

x = -3y - 13
_______________________________________________________

Add -7y to both of the sides.

5x + 7y + -7y = -9 + -7y

5x = -7y - 9

Then, divide both by 5.

5x
___    = -7y - 9 
5       _____
             5



Our Answer: </span> 5x
                      ___ = - 7y -9
                       5       _____
                                     5
                       
 _________________________________________________________      

Hope This Helps!!!
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olchik [2.2K]
The correct answer is:  [B]:  " 25 a²⁵ b²⁵ " .
_________________________________________________________
<span>Explanation:
_________________________________________________________
Given the expression: 
_________________________________________________________
       </span>→  " (−5a⁵b⁵)² (a³b³)⁵  " ;   Simplify.
_________________________________________________________
Let us being by examining:
______________________________________
       →    "(−5a⁵b⁵)² " . 

→  "(−5a⁵b⁵)²  = (-5)² * (a⁵)² * (b⁵)²  = (-5)(-5) * a⁽⁵ˣ²⁾ * b⁽⁵ˣ²⁾  = 25a⁽¹⁰⁾b⁽¹⁰⁾ ;

{Note the following properties of exponents:
    (xy)ⁿ = xⁿ * yⁿ ; 

    (xᵃ)ᵇ = x⁽ᵃ * ᵇ) ; 

    (xᵃ) * (xᵇ) = x⁽ᵃ ⁺ ᵇ⁾ .}.
______________________________________

Then, we examine:
______________________________________
      →    "(a³b³)⁵ " .

→  "(a³b³)⁵ = a⁽³ˣ⁵⁾b⁽³ˣ⁵⁾ = a⁽¹⁵⁾b⁽¹⁵⁾ .
______________________________________

So:   " (−5a⁵b⁵)² (a³b³)⁵ = (-5)a⁽¹⁰⁾b⁽¹⁰⁾ * a⁽¹⁵⁾b⁽¹⁵⁾  " ; 
________________________________________
Now, we simplify:

          →  " 25a⁽¹⁰⁾b⁽¹⁰⁾ * a⁽¹⁵⁾b⁽¹⁵⁾ " ; 

→  " 25a⁽¹⁰⁾b⁽¹⁰⁾ * a⁽¹⁵⁾b⁽¹⁵⁾ ;
 
               =  25a⁽¹⁰⁾ a⁽¹⁵⁾b⁽¹⁰⁾ b⁽¹⁵⁾  ;

               =  25a⁽¹⁰ ⁺¹⁵⁾ b⁽¹⁰⁺¹⁵⁾ ;

               =  25a⁽²⁵⁾ b⁽²⁵⁾ ; 
_______________________________________________
  →  which is:  Answer choice:  [B]:  " 25 a²⁵ b²⁵ " .
______________________________________________
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Step-by-step explanation:

Hope this helps you out! :)

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