thefaria thefaria

14-07-2017
Mathematics

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Find the solution of this system of equations.
Separate the x- and y-values with a comma.
x= -8 + y
-9x + 6y= 9

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choixongdong choixongdong

14-07-2017

x= -8 + y
-9x + 6y= 9

substitute x= -8 + y into -9x + 6y= 9

-9x + 6y= 9
-9(-8 + y) + 6y= 9
72 - 9y + 6y = 9
-3y = -63
y = 21

x= -8 + y
x= -8 + 21
x = 13

solution (13, 21)

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