So i've been sitting on this two part question and i just can't get it. someone me. which equation does not belong with the other three? a) y=−5x−1 b) 2x−y=8 c) y=x+4 d) y=−3x+13 explain your reasoning. a) the slope of this equation is negative. b) the y-intercept of this equation is negative. c) the equation is in standard form. d) the slope of this equation is positive.