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-4/3

Step-by-step explanation:

Slope is Rise over run. So you take y2-y1 over x2-x1.

in this case, the two points are (2,-1) and (-1,3).

3--1

-1-2

You get 4 over -3, which gives you a slope of -4/3

x = -4

step-by-step explanation:

- 20 - 4(x + 3) = 4x

=> -20 - 4x - 12 = 4x

=> - 32 -4x = 4x

=> -32 = 4x + 4x

=> - 32 = 8x

=> -32/8 = x

=> -4 = x