exam Maths Puzzle Numerical Ability

how do i graph the circle, x^2 + 4y^2 =1

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exam Other Question

Tutor please help and would you please solve by substitution method.

x = 1/8y - 1

y = 1/4x + 39

I would be very grateful for your help.
Thank you Please help me figure the following problem out. Thank you

One leg of a right triangle is 6 cm longer than the other leg. The length of the hypothenuse of the triangle is 18 cm. Find the length of the two legs?