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x + y = 21 x - y = 3 express the following using the elimination method

Sagot :

Solution

x + y = 21

x - y = 3

Add both equations to eliminate y

x + y + x - y = 21 + 3

2x = 24

x = 24/2

x = 12

Sunstitute x = 12 into the first equation

x + y = 21

12 + y = 21

y = 21 - 12

y = 9

Thus, x = 12, y = 9

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