8A.15

Represent constraints by equations and/or inequalities, and solve systems of equations and/or inequalities, interpreting solutions as viable or nonviable options in a modeling context. Limit to contexts arising from linear, quadratic, exponential, absolute value, and linear piecewise functions. [Algebra I with Probability, 13]

Khan Academy Resources

Intro to slopeNumber of solutions to system of equations reviewSlope formulaSubstitution method review (systems of equations)Slope reviewSlope-intercept form reviewSystems of equations with substitutionSystems of equations with graphingSystems of equations with substitutionSlope-intercept introSlope from two pointsSlope-intercept from two pointsSystems of equations word problemsSlope from graphNumber of solutions to a system of equations graphicallySlope-intercept equation from graphSlope from equationNumber of solutions to a system of equations algebraicallySolutions of systems of equationsSystems of equations: trolls, tolls (2 of 2)Systems of equations: trolls, tolls (1 of 2)Systems of equations number of solutions: fruit prices (1 of 2)Systems of equations with substitution: -3x-4y=-2 & y=2x-5Systems of equations number of solutions: fruit prices (2 of 2)Worked example: slope from graphConverting to slope-intercept formSystems of equations with substitution: y=-1/4x+100 & y=-1/4x+120Systems of equations with substitution: y=4x-17.5 & y+2x=6.5Systems of equations with substitution: 9x+3y=15 & y-x=5Slope of a line: negative slopeWorked example: slope from two pointsSlope of a horizontal lineSystems of equations with substitution: 2y=x+7 & x=y-4Systems of equations with substitution: y=-5x+8 & 10x+2y=-2Slope & direction of a linePositive & negative slopeNumber of solutions to a system of equations algebraicallySlope from equationWorked examples: slope-intercept introIntro to slope

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