Respuesta :
Hello:
the equation is : y = ax+b
the slope is a : a×(3) = -1......( perpendicular to a line with a slope of 3) because : y=3x+4 .... 3 is the slope )
a = -1/3 y=(-1/3)x+b
the line that passes through (3, 4) :4 = (-1/3)(3)+b
b =5
the equation is : y = (-1/3)x+5