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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
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Y = 3(0) - 21
Y = - 21
no
3xy
x = ab x = 21*37 x = 777
x/5 = 8/21 x = 8/21 * 5 x = 1.904761905
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