exam Maths Puzzle Numerical Ability

Solve by substitution. Please help.
8x-4y = 16
y = 2x -4
Thanks in advance.

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Tutor Can you help me please? How do I divide and simplify this equation?

9y^4 over 6y divided by y^2 over 3

Thank you!!! For 1985 through 1996,the number,C(in thousands),of videos rented each year Moose Jaw can be modeled by C=0.09(t^3+5t^2+31t+500),where t=0 represents 1990.During which year are 97.