ABCD ~ EFGH find value of y

What are the solutions of the system? solve by graphing. y = -x^2 -6x - 7 y = 2

Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!

Asap! i need this done today and i really don’t understand it. some one ! will mark