exam Maths Puzzle Numerical Ability

solve using the addition method
3x+2y=1
5x+3y=3

can you show me how to work this problem out?

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exam Other Question

Write an equation of the line satisfying the given conditions. Write the answer in slope-intercept form.
The line passes through (3,15) and (3,10)

Thank you. Please help me on my homework

prove the identity

sec^6A-tan^6A=1+3sec^2Atan^2A