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Consider the system.
6x-3y = 66
x + 3y = -10

Complete the description for three different substitution methods that can be used to solve the system.

Solve the second equation for x (x = - 3y) and then substitute the value into the first equation.
Solve the first equation for y (y = 2x - ) and then substitute that value into the second equation.
Solve either equation for 3y (3y = - x or 3y = 6x - ) and then substitute that value into the other equation.



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