exam Maths Puzzle Numerical Ability

solve the system of equations using the echelon method.
5x-3y=-1
2x-7y=17

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exam Other Question

Given f(x) = x2 - 2x + 6, find f(0). Pablo invested $445,000 in two bonds. The first bond paid 3% interest per year and the second 8% per year. The total interest pablo received in one year was $2850. How much did he invest in each bond?