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-7y + 21 = 3x
Add '7y' to both sides
21 = 3x + 7y
Subtract '3x' from both sides
21 - 3x = 7y
'Swop around'.
7y = -3x + 21
Divide both sides by '7'
y = -(3/7)x + 3
The slope of a straight line is the coefficient of 'x'
In this case it is ' -3/7'.
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