Question

-2x - 5y = -1

Answer 1

The good option to multiply the top equation by is -4

REASON :-

This is because, when we solve the equations, in the left side of first equation :-

☆ -2 can be multiplied by -4 to get the value 8 on the left side of second equation.

☆ This can help in easier elimination in the given set of equations.

■ The process is to be done as per the given below way :

$(-4)×-2x - 5y = -1 \\ 8x + 4y = 16$

$= > ( - 4 \times - 2)x - 5y = -1 \\ 8x + 4y = 16$

$= > 8x - 5y = -1 \\ 8x + 4y = 16$

Now the 8x on both equations can be cut.