book Maths Puzzle Numerical Ability

Solve each equation for y.
y + 1/2 = -1/3 (x + 1/2)

ISBN: 13-978-0-07-326862-0

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Please help with this problem. (4x)^3(8x^-5)
I know that the ^3 means to multiply 4x times 4x times 4x.
In the second part, I believe the 8 does not get multiplied by the ^-5, o In A.D. 1054, Chinese astronomers observed a light from a supernova in the night sky. This supernova was the incredibly powerful origin of what is now the Crab Nebula.