Math Ratios | MathHelp.com @yourteachermathhelp

Uploaded January 2016 | Updated September 2026, 2 weeks ago

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This lesson covers math ratios. Students learn that the ratio of one number to another is the result of the first number divided by the second number. Given various figures, students are then asked to determine ratios of side lengths or angle measures. Students are also given word problems involving ratios.

$Imaginary Numbers | MathHelp.com Need a custom math course? Visit http://www.MathHelp.com. This lesson covers imaginary numbers. Students learn that the imaginary number i is equal to the square root of -1, which means that i^2 is equal to (the square root of -1) squared, which equals -1. Students also learn to simplify imaginary numbers. For example, to simplify the square root of -81, think of it as the square root of -1 times the square root of 81, which simplifies to i times 9, or 9i. To simplify 11/8i, the first step is to get rid of the i in the denominator by multiplying both the numerator and the denominator of the fraction by i, to get 11i/8i^2, and remember that i^2 = -1, so we have 11i/8(-1), or 11i/-8, or -11i/8.$

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$Graphing Lines Using an X/Y Chart | MathHelp.com Need a custom math course? Visit http://www.MathHelp.com. This lesson covers graphing lines using an x/y chart. Students learn to graph a given linear equation using a chart. For example, to graph the equation y = x - 4, pick three values for x, such as -1, 0, and 1, and substitute these values into the equation to find the corresponding values of y. Next, plot the resulting points on a coordinate system and graph the line that passes through them. To graph the equation 3x + 5y = 5, first solve for y, to get y = -3/5x + 1. Then set up a chart, pick three values of x, such as -5, 0, and 5 (multiples of 5 so that the corresponding values of y will not be fractions), find the corresponding values of y, and graph the line.$

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