The two original functions are 4x+9y=7 and 4x-9y=9 To use the combination method, add all the values of the two equations together to cancel out one of the variables 4x+4x+9y-9y=7+9 8x=16 8x/8=16/8 x=2 4(2)+9y=7 8+9y=7 8-8+9y=7-8 9y=-1 y=-[tex] \frac{1}{9} [/tex]
