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First, get in standard form.

3X - Y = 21

-Y = -3X + 21

Y = 3X - 21

now set both variables equal to 0 to find intercepts/values

3X - 21 = 0

3X = 21

X = 7

----------

Y = 3(0) - 21

Y = - 21

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Q: What is the value of x and y in 3x-y equals 21?
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