Question

5x+15y=10 5x-10y=-40

Answer 1

{ 5x + 15 y = 10
  5x  - 10 y = -40  * (-1)

{ 5 x + 15 y = 10
  -5 x + 10 y = 40
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             25 y = 50
                   
                 y = 50 / 25
                 
                 y = 2

For x :

5 x + 15 y = 10

5 x + 15*(2) = 10

5x + 30 = 10

5x = 10 - 30

5x = -20

x = -20 / 5

x = - 4

hope this helps!.

Answer 2

5(2y-8)+15y=10= 25y=50= Y=2
x=2y-8 and Y= 2
X=2(2)-8=-4
(X,Y)= (-4,2)