Maria wants to solve the following system using the elimination method:

4x + 9y = 59
x + y = 17

What number should the equation x + y = 17 be multiplied by to eliminate y?

Question

Maria wants to solve the following system using the elimination method: 

4x + 9y = 59 
x + y = 17 

What number should the equation x + y = 17 be multiplied by to eliminate y?

welshfella · Answer

you have 9y in the first equation
- so what should we multiply equation 2 by?

welshfella · Answer

we have y in the second equation and we want it to be 9y

anonymous · Answer

-9 @welshfella

welshfella · Answer

that correct
- so when you add the equations the y will be eliminated

welshfella · Answer

you could also multiply by 9 and subtract but its not usually recommended as subtracting , especially if there are negative terms,  is not so easy

anonymous · Answer

thank you so much @welshfella

welshfella · Answer

yw