Question

x + y = 20
x - y = 30
Find x and y​

Answer 1

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x + y = 20

x - y = 30

Adding

2x = 50

x = 50/2 = 25

x=25

x-y=30

25-y=30

y=25-30

y=-5

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Answer 2

Add;

x + y= 20 _1

(+) x - y = 30 _2

------------------

2x =50

x = 25

Substitute in -1

25 + y =20

y = 20-25

y = -5