exam Maths Puzzle Numerical Ability

Show by counterexample that (x + y)^-2 and x^-2 + y ^-2 are not equivalent.

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exam Other Question

Tutor can you help me to find the slope of these two lines y = -7.921 and
x = 9.124

Thank you Please help. Thank you

Solve:

1/4 =8^6x+5