9 is.
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If you mean y = -9x+11 then it is a straight line equation whereas -9 is the slope and 11 is the y intercept
If you mean 9x-2y = 6 then it is a straight line equation that can be expressed as y = 4.5x-3 whereas 4.5 is the slope and -3 is the y intercept.
slope intercept form is y=mx+b where m is the slope and b is the y intercept. y=9x+5 is the slope intercept form. In standard form Ax+Bx=c would be 9x-y=-5
Points: (1, 9) and (0, 0) Slope: 9 Equation: y = 9x
If you look at the slope intercept formula (y=mx+b), and the m is positive, then the line will have an upward slope (ex. y=8x+2) if the m is negative the line will have a downward slope (ex. y=-9x+6).