math - algebra

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how would i solve this using the substitution method

3y=11-x
3x-y=3

thanks

• math - algebra -

Substitute 11 -3y for x in the second equation.
Why? Because the first equation tells you that
x = 11 -3y.

You should get
3(11 -3y)= 3 + y
33 - 9y = 3 + y
10y = 30
y = ___ ?

Then solve for x, using either of the first two equations you were given.

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