exam Maths Puzzle Numerical Ability

Please help me solve this equation...thank you.
X+Y=2
6X+Y=2

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exam Other Question

What kind of polynomial is the one shown below? Hint: Think in terms of degree.

f(x)=15x^4-2.5x^3+3/5x^2+3x+1 Find the fourth roots of 1 - j. Write each of the four answers in trigonometric form.