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Solve using substitution. 8x + 9y = –17 y = –9
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20 votes
Solve using substitution.

8x + 9y = –17
y = –9

User Sfinnie
by
5.5k points

1 Answer

8 votes
SUBSTITUTE -9 as y in the equation

8x + 9(-9) = -17
8x + (-81) = -17
8x -81 = -17

COLLECT LIKE TERMS

8x = -17 + 81
8x = 81 - 17
8x = 64

DIVIDE BOTH SIDES BY 8

8x/8 = 64/8
x = 8

Therefore, y = -9 and x = 8
User Schlangi
by
5.3k points
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