Question 1082589
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Very easy.

Simply substitute the expression y = 5x - 17 of the first equation into the second equation, replacing "y". 
You will get a single equation for "x":

8x + 6*(5x-17) = -14.

Simplify and solve it for "x".


Then restore "y" using the first equation.
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This method is called the "substitution method".