exam Maths Puzzle Numerical Ability

Hello

how to solve each system by substitution:

y = 2x - 8
4x + 3y = 1

thank you.

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exam Other Question

What makes a number real, whole,natural, interger, irratiional, rational? 14. In 2000, the average American generated 4.5 lb of waste per day. How much of that was paper and cardboard?
How do I solve this?