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Standard 3: Algebra and Functions Students use variables in simple expressions, compute the value of an expression for specific values of the variable, and plot and interpret the results. They use two-dimensional coordinate grids to represent points and graph lines. 5.3.1 View Resource(s) Use a variable to represent an unknown number. 5.3.2 View Resource(s) Write simple algebraic expressions in one or two variables and evaluate them by substitution. 5.3.3 View Resource(s) Use the distributive property in numerical equations and expressions. 5.3.4 View Resource(s) Identify and graph ordered pairs of positive numbers. 5.3.5 View Resource(s) Find ordered pairs (positive numbers only) that fit a linear equation, graph the ordered pairs, and draw the line they determine. 5.3.6 View Resource(s) Understand that the length of a horizontal line segment on a coordinate plane equals the difference between the x-coordinates and that the length of a vertical line segment on a coordinate plane equals the difference between the y-coordinates. 5.3.7 View Resource(s) Use information taken from a graph or equation to answer questions about a problem situation.