The slope intercept form of a straight line is given by the general equation below
[tex]y=mx+c[/tex]Where, y is the dependent variable, x is the independent variable, m is the slope or the gradient, while c is the intercept on the y-axis
Given that the slope,m and the intercept, c is as shown below
[tex]\begin{gathered} m=-1 \\ c=0 \end{gathered}[/tex]Substituting the values of m and c into the general equation will give:
[tex]\begin{gathered} y=mx+c \\ y=(-1)x+0 \\ y=-x \end{gathered}[/tex]Hence, the slope intercept form of the equation is y = - x