exam Maths Puzzle Numerical Ability

Solve the system by graphing.
x-y=-3
x-y=4

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exam Other Question

The polynomial 1600x^3+1200x^2+800x represents your savings, with interest, from a summer job after three years. The annual interest rate equals x-1. Find the interest needed so that you will have $4000 at the end of three years. What is the rule for x 1 2 3 4 5 6
y-1-4-7-10-13-16