find the value of r so that the line through (2,-3) and (-4,r) has a slope of -1/2 | please explain steps

r = 0

Step-by-step explanation:

slope formula is the difference of the y-values over the difference of the x-values

[r-(-3) / -4-2] = -1/2

r+3/-6 = -1/2

cross-multiply:

2(r+3) = (-1)(-6)

2r + 6 = 6

2r = 0

r = 0

no i do not : ( what is it?

answer: c.  

step-by-step explanation:

mixtures containing substances that get attracted to magnet can be separated using a magnet. we can separate iron from a mixture of sand and iron, as only iron attracts to the magnet.