Sundar used linear combination to solve the system of equations shown. He did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. What number did Sundar multiply the second equation by?

@ganeshie8 @satellite73 @Kainui @pooja195 @wio Can you please help me? I'm really confused. I've already had like three of these open and everyone just stops and disappears. Please help if you can!! c:

Question

Sundar used linear combination to solve the system of equations shown. He did so by multiplying the first equation by 5 and the second equation by another number to eliminate the y-terms. What number did Sundar multiply the second equation by? 

@ganeshie8 @satellite73 @Kainui @pooja195 @wio Can you please help me? I'm really confused. I've already had like three of these open and everyone just stops and disappears. Please help if you can!! c:

anonymous · Answer

it depends largely on what the equations are

anonymous · Answer

Oh, sorry. Here's the equation.

anonymous · Answer

@satellite73

anonymous · Answer

if multiplied by 5, the y terms would have coefficient 45
multiply the second by $-9$ and the coefficient of the y term will be $-45$ so when you add they drop out

anonymous · Answer

Wait so it would be -9?

anonymous · Answer

yes

anonymous · Answer

that matches them up so that they drop out when added