Question

Solve the following simultaneous equation step by step:

3x-y=9
4x-y=-14

Answer 1

by substituting
3x=9+y
X=9+y/3
4(9+y/3)-y
36+4y/3-y=-14
4y/3-y=-50
4y-3y/3=-50
y=-150

Answer 2

$3x - y = 9 ...equation(1) \\ \\ 4x - y = 14..equation(2) \\ \\ take \: \: equation(1) - equation(2) \\ \\ 3x - y = 9 \\ 4x - y = - 14 \\ - \: \: \: + \: \: \: \: \: \: \: + \\ - - - - - - - - - \\ - x = 23 \\ \: x = - 23...ans \\ \\ value \: of \: x \: put \: any \: equation \\ \\ = > 3( - 23) - y = 9 \\ \\ = > - 69 - y = 9 \\ \\ = > - y = 9 + 69 \\ \\ = > y = - 78...ans$

hope it helps you