Quandaries
and Queries |
|||

Daniel Secondary education Student Simultaneous equations
I find this near impossible |
|||

Hi Daniel, What I want to do is to use the two equations you have to produce one equation in one unknown which I can solve. In other words I want to either eliminate the x terms or eliminate the y terms. I am going to eliminate the y terms. In the first equation the coefficient of y is 3 and in the second equation the coefficient of y is -7. Hence if I multiply the first equation by 3 the coefficient of y will be 21, and if I multiply the second equation by 3 the coefficient of y will be -21. If I then add the two equations the y terms will disappear.
Multiply the first equation by 7 and the second by 3
so
Add the two equations to get
If you now substitute x = 2 into the first equation you get
Penny |