Determine the equations of the recipes that pass through the following pairs of points P1 (2;-1) and p2 (4;-1)

initially we find slope (m) $$ m=\frac{y_2-y_1}{x_2-x_1}=\frac{-1-(-1)}{4-2}= 0 $ $$ since slope is 0 the equation will be equation of horizontal line which is $$ y=y_1 $$ Thus y = -1