book Maths Puzzle Numerical Ability

How Do You Find The Slope

For Example:

(-3,10) (2,0)

(0,1) (6,1)

(-2,-16) (4,8)

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book Other Question

how do I do:
x=-3y+10
-x+y=-10

using the substitution method i need you to show me the steps in finding the right answer for the following problem: Marla begins walking at 3mi/h toward the library. Her friend meets her at the halfway point a