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# Test yourself now

High marks in science are the key to your success and future plans. Test yourself and learn more on Siyavula Practice.

## 4.8 Chapter summary (EMA3K)

• A linear equation is an equation where the exponent of the variable is $$\text{1}$$. A linear equation has at most one solution.

• A quadratic equation is an equation where the exponent of the variable is at most $$\text{2}$$. A quadratic equation has at most two solutions.

• To solve for two unknown variables, two equations are required. These equations are known as a system of simultaneous equations. There are two ways to solve linear simultaneous equations: algebraic solutions and graphical solutions. To solve algebraically we use substitution or elimination methods. To solve graphically we draw the graph of each equation and the solution will be the coordinates of the point of intersection.

• Literal equations are equations that have several letters and variables.

• Word problems require a set of equations that represent the problem mathematically.

• A linear inequality is similar to a linear equation and has the exponent of the variable equal to $$\text{1}$$.

• If we divide or multiply both sides of an inequality by any number with a minus sign, the direction of the inequality changes.