Retail price is the price an item is selling for in store so I would say yes unless its on sale.
2x + 3 = 9 Move all terms not containing x to the right side of the equation.
2x = 6 Divide each term by 2 and simplify.
x=3
Not sure what you’re asking but the answer is y=9x+7 in slop intercept form
U first convert it into improper fraction :
2 7/10
=20+7/10
=27/10
=2.7 ...
Hope it helps !!!