There is a theorem :
Proof: open the brackets on right side of equality by using distributive property
RHS = a(a+b) - b(a+b)
RHS =
RHS = = LHS
Using the above theorem you can solve every question you asked:
Answer:
(1,2) and (2,-1)
Step-by-step explanation:
we have
----> inequality A
The solution of the inequality A is the shaded area below the dashed line
---->inequality B
The solution of the inequality B is the shaded area above the dashed line
The solution of the system of inequalities is the triangular shaded area between the two dashed lines
If a ordered pair is a solution of the system of inequalities, then the ordered pair must lie on the shaded area
Two points in the solution are(1,2) and (2,-1)see the attached figure
