How do you solve the following system: # 8x-7y=-39, 7x − 5y = −11 #?
Sub x=118/9 into (1)
I have solved
Check your solution with that in the graph.
I choose to answer this the traditional way.
Example of the principle used. When I realised this (long time ago) it opened the door for me to a whole new way of thinking.
Suppose we have
Then it is also true that
If we change one or both of these then subtract it will eliminate one of the unknown. Then we have 1 equation with 1 unknown and thus solvable
Lets 'get rid' of the
Divide both side by -9
I will let you determine