Do 21 divided by 2 and you’ll get 10.5 so the original price was $10 and 50 cents
X= -x over 2 (negative x as a fraction and 2 is the denominator) minus y+ (seven as the numerator over 2 as the denominator).
Solve for y by simplify both sides with inverse operations, then isolate the variable and you get, y = 3x - 1.
The greatest common factor is 1
Wouldent the answer be A because all percents are out of 100 so the 1.9 would be 9 over 100
