Posted by **lisa** on Sunday, June 30, 2013 at 4:27pm.

x-5y=-21

9y-8x=44

substitution method

- math -
**Ms. Sue**, Sunday, June 30, 2013 at 4:47pm
x-5y=-21

9y-8x=44

x = 5y - 21

9y - 8(5y - 21) = 44

9y - 40y + 168 = 44

-31y = 44 - 168

-31y = -124

y = 4

Take it from there.

- math -
**Kuai**, Sunday, June 30, 2013 at 4:54pm
x = 5y -21

9y-8(5y-21) = 44

9y -40y +168 = 44

-31y + 168 = 44

-31y + 168 -168 = 44 -168

-31y = -124

y = 4

x = 5(4)-21 = -1

(-1, 4)

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