Solve the following simultaneous equation. 4x + y = 57 7x -2y = 21
Answers
Answered by
0
Answer:
4x+7y=20⟶(i)21x−13y=21⟶(ii)
Multiplying (i) by 21 and (ii) by 4.
84x+147y=420⟶(i)84x−52y=84⟶(ii)
On substraction : 199y=336y=199336
Putting the value of y⟶(i)
4x+7×199336=20⇒4x=20−7×199336⇒4x=1993980−2352∴x=4×1991628x=199407
Similar questions