Get y by it’s self so
Subtract 5y:
-5y+4x=1
Then get x to other side by subtracting 4x:
-5y=-4x+1
Then divide by -5 to get y by it’s self:
y=(4/5)x+(1/-5)
And since there are two negatives -4 and -5 I took off the sign because they cancel out.
And slope is what is in front of x in the end so
4/5