PLEASE HELP ASAP! Use substitution to find the solution to the linear/quadratic system.

y−2x2=4x+1
y=14x−7
Blank 1: (___,7)
Blank 2: (___,49)

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.