In the following system of equations, if the first equation is multiplied by 3, what would the second equation need to be multiplied by to eliminate y by addition?

3x + 5y = 10
4x - 3y = 12

Question

In the following system of equations, if the first equation is multiplied by 3, what would the second equation need to be multiplied by to eliminate y by addition?

3x + 5y = 10
4x - 3y = 12

anonymous · Answer

when the first equation is multiplied by 3, you get 9x + 15y =10
to eliminate the y by addition, the y variable in the second equation has to be -15y
what number do you think gives that when multiplied by the second equation?