A.A.24 Algebraic equation & Inequalities
How Braulio, Numan, Monshur, and Willy solved an algebraic inequality in their UR
The problem
Solve for X:
Willy: Why do you change the sign from < (is less than) to > (is greater than)?
Braulio: You need to change the sign when you are solving problems with inequality signs.
Willy: But why?
Monshur: Look [point to the text] you don’t change the sign.Numan: You don’t have to change the sign, but I don’t know why
The problem Example from UR
Willy: I learned that you change the sign (inequality) when you divided by a negative number, but here you divided by positive 4, so keep the sign.
Willy’s Ah-Ha Moment!!
Our Take Away
(1) If each side of an inequality is divided by the negative number, then change the sign.
(2) They referenced to an existing example.