This week we mainly learned how to solve quadratic, linear inequalities and quadratic systems of equations by graphing. Graphing plays an important role in solving equations and inequalities, especially in quadratic ones.
For the linear and quadratic inequalities, we need to graph the boundary line or parabola first, then test some points in different scales to find the solutions.
To solve the systems, we only need to graph every equation on the graphing paper and find the crossing point of them. Those points are the solutions of the systems.
I need to remember that x belongs to real numbers. I always forgot about adding it in the end.