Solve the simultaneous equation x y 2 and 3x-2y... - WAEC Mathematics 2007 Question
Solve the simultaneous equation: x+y=2 and 3x-2y=1
A
x=2 and y=1
B
x=1 and y=1
C
x=1 and y=2
D
x=-1 and y=1
correct option: b
x + y = 2 --- eqn I
3x - 2y = 1 --- eqn II
Multiply eqn by 2
2x + 2y = 2 --- eqn III
Subtract eqn II from eqnI
5x = 5 => x = 1
Substitute 1 for x in eqn 1
1 + y = 2 => y = 1
3x - 2y = 1 --- eqn II
Multiply eqn by 2
2x + 2y = 2 --- eqn III
Subtract eqn II from eqnI
5x = 5 => x = 1
Substitute 1 for x in eqn 1
1 + y = 2 => y = 1
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