Plz help Solve the system by Substitution

y=2x+15

7x+2y=−14

A(-6, 3)

B(4, -7)

C(6, -7)

D(-4, 7)

When eating out, record the total cost of your meal (before tip) and the tip that you left. determine the percent of the cost of the meal that you left as a tip.

Enter the number of complex zeros for the polynomial function f(x) = x 4+ 5x² +6

33% of college students say they use credit cards because of the rewards program. you randomly select 10 college students and ask each to name the reason he or she uses credit cards. find the probability that the number of college students who say they use credit cards because of the rewards program is (a) exactly two, (b) more than two, and (c) between two and five inclusive. if convenient, use technology to find the probabilities.