A-REI

A-REI.1Explain each step in solving a simple equation as following from the equality of numbers asserted at the previous step, starting from the assumption that the original equation has a solution. Construct a viable argument to justify a solution method.A-REI.10Understand that the graph of an equation in two variables is the set of all its solutions plotted in the coordinate plane, often forming a curve (which could be a line).A-REI.11Explain why the x-coordinates of the points where the graphs of the equations y = f(x) and y = g(x) intersect are the solutions of the equation f(x) = g(x); find the solutions approximately, e.g., using technology to graph the functions, make tables of values, or find successive approximations. Include cases where f(x) and/or g(x) are linear, quadratic, absolute value, and exponential functions.A-REI.12Graph the solutions to a linear inequality in two variables as a half-plane (excluding the boundary in the case of a strict inequality), and graph the solution set to a system of linear inequalities in two variables as the intersection of the corresponding half-planes.A-REI.2Solve simple rational and radical equations in one variable, and give examples showing how extraneous solutions may arise.A-REI.3Solve linear equations and inequalities in one variable, including equations with coefficients represented by letters.A-REI.4Solve quadratic equations in one variable.A-REI.5Given a system of two equations in two variables, show and explain why the sum of equivalent forms of the equations produces the same solution as the original system.A-REI.6Solve systems of linear equations algebraically, exactly, and graphically while focusing on pairs of linear equations in two variables.A-REI.7Solve a simple system consisting of a linear equation and a quadratic equation in two variables algebraically and graphically. For example, find the points of intersection between the line y = -3x and the circle x^2 + y^2 = 3.A-REI.8Represent a system of linear equations as a single matrix equation in a vector variable.A-REI.9Find the inverse of a matrix if it exists and use it to solve systems of linear equations (using technology for matrices of dimension 3 × 3 or greater).
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