Jambmaths question:
Solve for x and y respectively in the simultaneous equations$\begin{align} & -2x-5y=3 \\ & x+3y=0 \\\end{align}$
Option A:
-9,3
Option B:
3,-9
Option C:
9,-3
Option D:
-3,-9
Jamb Maths Solution:
$\begin{align} & -2x-5y=3-----(i) \\ & x+3y=0------(ii) \\ & \text{from (}ii\text{) }x=-3y------(iii) \\ & \text{Substitute }-3y\text{ for }x\text{ in equation }(i) \\ & -2(-3y)-5y=3 \\ & 6y-5y=3 \\ & y=3 \\ & \text{Substitute 3 for }y\text{ in equation }(iii) \\ & x=-3(3)=-9 \\ & (x,y)=(-9,3) \\\end{align}$
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