exam Maths Puzzle Numerical Ability

was wandering if any one could help me with this

1/6f-5=1

-36 is this right, thank you for you time.

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exam Other Question
Solve the following problems.
What expression raised to the fourth power is 81x^12y^8z^16 ? Find the intercepts and then use them to graph the equation

1.1x-1.9y=4.18

I need to plot the points