Which pair of lines is perpendicular?
a. y=2x-1 and 2y=-x+3
b. y=3x+4 and 3y-x=5
c. y=-4x+2 and x+4y=6
d. y=-6x-3 and 6x-y=4

Suppose that x and y are both differentiable functions of t and are related by the given equation. use implicit differentiation with respect to t to determine startfraction dy over dt endfraction in terms of x, y, and startfraction dx over dt endfraction .

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil