Question

solve by substitution method 5a + 2a =8 ; 2a + b =3​

Answer 1

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5a+2b=8....... (i)

2a+ b=3........ (ii) ×2

4a+2b=6......(iii)

Now subtract equⁿ(i) &(iii)

5a+2b=8

-4a+2b=6

a =2

Therefore a=2

Now put a=2 in equⁿ(ii)

2a+b=3

2×2+b=3

4+b=3

4-3=-b

1=-b

b=-1

Therefore b = -1

(a, b) is (2,-1)

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