Question 248214
substitute the value of a quantity from one equation for the same quantity in another equation


5x = -11 - 9y ___ -5x = 11 + 9y


substituting ___ 11 + 9y + y = 21 ___ 10y = 10 ___ y = 1


substituting ___ 5x = -11 - 9(1) ___ x = -4