Questionn 15

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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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