y=mx+b
7x+3y=21
3y=21-7x
*****_
y=7-2.3x
*****_
m= -2.3
negative
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positive plus positive equals positive negative plus negative equals negative
Positive plus positive equals positive. Negative plus negative equals negative. Positive greater than negative equals positive. Negative greater than positive equals negative.
negative plus positive equals to zero
nope negative plus negative equals a negative -2+(-4)=-6 but negative times negative equals a positive
The slope is negative 2/3.