Question 109407
First let's find the slope of x – 4y = 12


*[invoke converting_linear_equations "standard_to_slope-intercept", 1, -4, 12, 2, 1]



Now let's find the slope of 4x + y = 4


*[invoke converting_linear_equations "standard_to_slope-intercept", 4, 1, 4, 2, 1]



Now multiply the slopes of {{{1/4}}} and {{{-4}}} to get {{{(1/4)(-4)=-4/4=-1}}}


Since the product of the two slopes is -1, the two slopes are perpendicular