y=ax+b is the standard form for a linear equation where a is the slope and b the intercept on the y axis of the line. So we can write the values of a and b for each of the listed equations: a=2, b=-1, y=2x-1; a=2/5, b=2, y=2x/5+2; a=0,b=4, y=4; a=5/6,b=-3, y=5x/6-3; a=-7/2,b=2, y=-7x/2+2; a=1/2,b=-1, y=x/2-1.