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2 years ago

5x +6y = 20 (1)

Mathematics

2 answers:

Andrej [43]2 years ago

7 0

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

slega [8]2 years ago

4 0

(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

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