3.3 Solution By Multiplication-Addition

Question 1

Rules of Equality

Answer 1

1- if both sides of an equation are multiplied by the same nonzero number, then the result is still an equation. Example if a=b, then ac=Bc for any c≠0

Question 2

Rules of Equality 2

Answer 2

2- if the same expression is added to both sides of an equation, then the results is still an equation. For example if a=b, then a+c=b+c.

Question 3

Multiplication-addition method

Answer 3

Multiplying one or both equations by a constant and then adding the equations.