Question 159428
from 1st eqn  __  -x=17y-47  __  x=47-17y


substituting into 2nd eqn  __  23y+81=3(17y-47)  __  23y+81=51y-141  __  222=28y  __  111/14=y


substituting  __  x=47-(17(111/14))  __ x=-1229/14