Question

5x +6y = 20 (1)

Answer 1

Answer:

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

Answer 2

(2) + (2)

=> 8x - 6y = -46 ———(3)

(1) + (3)

=> 5x + 6y + (8x - 6y) = 20 - 46

=> 13x + (6-6)y = -26

=> 13x + 0y = -26

=> 13x = -26

=> x = -26/13

=> x = -2

=> 5(-2) + 6y = 20

=> 6y = 20 + 10

=> 6y = 30

=> y = 5

x = -2, y = 5 => C