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If you want the y-intercept, then you want the value of y when x=0 so
3*0 - 9y = -27
-9y = -27
y = 3

If you want the x-intercept, then you want the value of x when y=0 so
3x - 9*0 = -27
3x = -27
x = -9

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Q: What is the intercept of 3x-9y equals -27?
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