book Maths Puzzle Numerical Ability

can you please help me with this problem {9a-3d=3
{3a+8d=-17

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book Other Question

write an equation for each line. then graph the line.
Through (-1,3) and parallel to y=2x+1 Without the use of a calculator, list the numbers 2^1/2, 3^1/3, 5^1/5 in order from largest to smallest.