Question

2a+3b=2 4a-9b=-1 by elimination method​

Answer 1

Answer:

4a-9b=-1

2a+3b=2

- - -

________

2a-12b=-3

Answer 2

Answer:

2a + 3b -2 = 0 ...... (i)

4a - 9b +1 =0

multiple eqn (i) by 2

4a + 6b - 4 = 0

4a - 9b +1. = 0

- + -

___________

15 b - 5 =0

b = 1/3

now,

multiple eqn (i) by -3 ........

-6a - 9b + 6 = 0

4a - 9b + 1 = 0

- + -

_________

- 10a + 5 = 0

a = 1/2

so, a = 1/2. b = 1/3

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