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

How do you simplify a rational expression like d+7/d^2-49, whats the answer? Find the slope and the y-intercept.
y=2.6x-9
Can someone help me please.