exam Maths Puzzle Numerical Ability

Please help w/ the following:
Solve:
x^2+y^2=100
x^2/100+y^2/16=1
Thank you.

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exam Other Question

Solve the ff. turn them to y form

1/3x=y+2
3x-2y+8=0
4x-10y=0
3/4x+2y=8
2/3y=-x/2-5/3x
1/2x+3/2x=2y+5-3y Graph the Solution for these inequality equations:

2x >= y-1 AND 2x-5y<=10

I cannot firgure out what to do.. what I have done so far is

2x >= y-1
-1+2x>=y-1+-1 (which