5x +6y = 20 (1) Al resolver el siguiente sistema de ecuaciones

los valores de las incógnitas son:

(4x-3y=-23 (2)

a) x= 2; y= -5

b) x= 13;y=1

c) x= -2; y= 5

c) x = -2; y = 5

Step-by-step explanation:

    4x - 3y = - 23   multiply by 2

    8x - 6y = - 46  

+   5x + 6y = 20   add the two equations

   13x + 0y = -26  divide by 13

               x = -2     enter x into either original equation

 5(-2) + 6y = 20

    -10 + 6y = 20

             6y = 30

               y = 5

72 is the answer to this problem

a. she will receive a refund of $278.

step-by-step explanation: