10 ! use elimination to solve the equation. 9x+2y=-17 -11x+2y=3

/ Solve equation [2] for the variable  y  

 [2]    7y = 12x + 17

 [2]    y = 12x/7 + 17/7

// Plug this in for variable  y  in equation [1]

  [1]    9x - 2•(12x/7+17/7) = -3

  [1]    39x/7 = 13/7

  [1]    39x = 13

// Solve equation [1] for the variable  x  

  [1]    39x = 13

  [1]    x = 1/3

// By now we know this much :

   x = 1/3

   y = 12x/7+17/7

// Use the  x  value to solve for  y  

   y = (12/7)(1/3)+17/7 = 3

Solution :

{x,y} = {1/3,3}

Step-by-step explanation:

answer:

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

explanation:

service only with 20% tip  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

in the opening of the question the word 'service' is associated only with the pretax value.

the closing part of the question asks: how much did she pay for the  

service

−−−−−−  

so technically the answer is  

→

$

72.6

(

1

+

20

100

)

=

$

87.12

however, the intention of the question provider may have been that your answer is to be  

$

87.12

(

1

+

8

100

)

=

$

94.09

to 2 decimal places.

'

payment just for service  

→

$

87.12

payment for service including tax

→

$

94.09

tony b

mar 21, 2017

answer:

trying to explain it another way

explanation:

service charge  

.

→

$

72.60

20% tip  

20

100

×

$

72.60

=

$

14.52

−−−−−−  

←

add

$

87.12

tax  

8

100

×

$

87.12

=

$

6.97

−−−−−  

←

add

$

94.09

related questions

idk

step-by-step explanation:

i don't know