exam Maths Puzzle Numerical Ability

(1)
Solve each of the following systems by substitution

5x-2y=-5

y-5x=3





(2)
Solve each of the following systems by substitution

8x-4y=16

y=2x-4

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exam Other Question
Plot the points P (-1,-4), Q (1,1)and R (4,2), on a coordinate plane. Where should the point S be located on that the figure PQRS is a parallelogram? Definition: If y is a real number, then y to 1st power = _________________