Posted by **Robin** on Sunday, April 11, 2010 at 4:52pm.

substitution method

7x +9y= 19

x=25-5y

___________

7(25-5y)+9=19

175-35 +9=19

-175 -175

_______________

-26y= -156

y=6

substitute for x

x=25-5y

x=25-5(6)

x=25-30

x=-5

now substitute

7x+9y=19

7(-5)+ 9(6)=19

-30+56=19

19=19 his part is wrong I believe explain if I need to do this differently?

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