standard form equation is y = mx + b where m =slope and b = y intercept
-9x + y = 21
add 9x to both sides
y = 9x +21
b = y intercept = 21
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9x-19=6x+2 so 3x=21 and x=7
it equals 13X.
The slope is 0.
Multiply first equation by 3: 9x + 15y = 63Add that and second equation: 19y = 57Divide by 19: y = 3, so x = 2
It is 9x