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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.

• An equation is a mathematical sentence that is true for some numbers, but false for other numbers. For example, $$2x + 10 = 20$$ will be true for $$x = 5$$.
• When we look for a number or numbers that make an equation true, we say that we are solving the equation or looking for a solution. A solution to an equation is a number that makes the equation true when you substitute it for the variable. For example, $$x = 10$$ is the solution to the equation $$- 5x = - 50$$.
• We name equations by looking at the highest power of $$x$$ in the equation:
• Equations with $$x$$ terms only are called linear. For example, $$y = 2x + 1$$.
• Equations with $$x^{2}$$ terms are called quadratic. For example, $$y = x^{2}$$.
• Equations with $$x^{3}$$ terms are called cubic. For example, $$y = 2x^{3}$$.