The variable z varies jointly with x and y. also, z = -75 when x = 3 and y = -5. what equation describes this variation? what is the constant of variation? k =

z = 5xy

Step-by-step explanation:

since z varies jointly with x and y then

z = kxy ← k is the constant of variation

to find k use the given condition z = - 75 when x = 3 and y = - 5

k = = = 5 and

z = 5xy ← equation of variation

hiking down a winding trail.

step-by-step explanation:

2(2x + 3) = -4 + 2(2x + 5)

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 6

4x - 6 + 6 = 4x - 6 + 6

4x = 4x

x = x

unlimited solutions.