Question

2x + y = 9 .................. (i)
x + 2y = 21 .................. (ii)

Answer 1

Answer:

Step-by-step explanation:

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Answer 2

Answer:

x=-1

y=11

Step-by-step explanation:

2x + y = 9   (equation 1)

x + 2y = 21 (equation 2)

2x + y = 9   ×1

x + 2y = 21  ×2

2x+y=9

2x+4y=42

-    -     -

0  -3y=-33

      y=11

sub in equation 1

2x+11=9

2x=-11+9

 x=-11+9

 x=-2/2

x=-1