Question

Solve by subituting method x+18=2y ;y=2x-9​

Answer 1

Answer:

x = 12

y= 15

Step-by-step explanation:

x+18=2y

x - 2y + 18 =0

2x - y - 9 =0 multiply by -2 => -4x + 2y + 18

Now add both exquation

x - 2y + 18 =0

-4x + 2y + 18

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

-3x + 36 = 0

3x = 36

x = 36/3

x = 12

Now

x - 2y + 18 =0 substitue x = 12

12 - 2y + 18 = 0

-2y = -30

y = 30/2

y= 15

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