exam Maths Puzzle Numerical Ability

two equations
5x^2 + 3y^2 =17
-x+y=-1
i need to find the points of intersection ,if any, of the graphs in the system

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exam Other Question

Indicate whether the problem is true or false but show all work
sin 0(with a dash through it) = 1/csc 0(with a dash through it))
linear systems by addition

i cannot figure this one out
3x-7y=13
6x+5y=7