book Maths Puzzle Numerical Ability

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

using the substitution method

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book Other Question

My question says to simplify the radicals.

4 square root of 3+2 square root of 12

Could you help me? thanks! How Do You Find The Slope

For Example:

(-3,10) (2,0)

(0,1) (6,1)

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