A) \[x+y=1\] and \[2x-3y=-5\]
B) 2x+5y=-11 and \[4x+10y=-22\]
C) \[2x-y=1\]and \[3x+2y=0\]
D) \[x-4y-14=0\]and \[5x-y-13=0\]
Correct Answer: B
Solution :
If x = 2, y = - 3 is a unique solution of any pair of equation, then these values must satisfy that pair of equations. |
From option [b], |
LHS \[=2x+5y=2\left( 2 \right)+5\left( -3 \right)\] |
\[=4-15=-11=\]RSH |
and \[=4x+10y=4\left( 2 \right)+10\left( -3 \right)\] |
\[=8-30=-22=\]RHS |
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