# Mat 116

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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?

• Mat 116 -

The last lines...

7(-5)+9(6)=19
-35+54=19
19=19

You made two math errors on yours

• Mat 116 a -

Anwers to math week 6 uop

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