exam Maths Puzzle Numerical Ability

please help me understand:

explain how to apply substitution in solving a system of equations.

Thank you.

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exam Other Question

Can anyone help with this?

A line passes through the point (-4,-9) and has a slope of -3 . Write an equation for this line in x,y -coordinates. how do i solve this? a+1 over 2 = 1 over a? Please Help fast as you can!