Find the slope, if its exists

y= -7x + 3
y=-7x+3
y=-4
Is this right help me

y = m x + b

where m is the slope and b is the value of y on the y axis where x is zero.(The "y axis intercept")
In this case
y = (-7) x + 3
so m, the slope, = -7
and b, the y intercept, = 3