Book Maths Puzzle Number System

How do I evaluate the algebraic expression for the given values of the variable(s)
a-9 over 2b

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Book Other Question

How do I solve a system of equations using substitution when the euations are
y=x+4
y=3x
The answer can either be no solution or infinitely many solutions, please explain your w
How to use the distributive property to expand the expression
-3(-2x-8y)