Answer:
y = -3z - 3
Explanation:
y=mz+b ==> slope-intercept form where m=slope
9z + 3y = -9
9z - 9z + 3y = -9z - 9 ==> solve for y
3y = -9z - 9
(3y = -9z - 9)/3 ==> divide equation by 3 to isolate y
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