🔢 9th grade Math: how to help at home

What each unit covers

1. 📈Linear Relations

   Finding slope from points and graphs, reading y = mx + b, finding intercepts, deciding whether a point is on a line, spotting parallel lines, and using rates of change in stories.

2. 🧭Coordinate Geometry

   Finding the distance between two points with the Pythagorean Theorem, the midpoint of a segment, slopes of segments, telling parallel and perpendicular lines apart, and using slopes to check for a right angle.

3. 📉Lines & Intersections

   Finding where two lines meet and what it means in a story, graphing x = k, y = k and ax + by = k, regions of an inequality, and translating, reflecting and rotating lines through the origin.

4. 🔣Function Notation

   Evaluating and solving with function notation, and naming the domain and range of a function, including a sensible domain in a real situation.

5. ⚖️Multi-Step Equations

   Solving linear equations with brackets, fractions and variables on both sides, checking solutions, and turning word problems into equations.

6. ⚖️Linear Inequalities

   Solving linear inequalities (flipping the sign when dividing by a negative), checking a solution, and writing inequalities from budgets and limits.

7. 🔗Solving Systems

   Solving systems of two linear equations by elimination and substitution, and writing a system from a word problem.

8. 📊Data & Scatter Plots

   Finding the median and quartiles of a data set, reading a box plot, telling positive, negative and no correlation apart, and using a line of best fit to make predictions. Correlation does not prove one thing causes another.

9. 🧮Two-Way Tables & Causation

   Reading two-way frequency tables, finding conditional relative frequencies, spotting associations, and knowing that correlation does not prove causation.

10. 🧩Polynomials

    Naming polynomials by terms and degree, combining like terms, subtracting polynomials, multiplying and dividing by a constant, and substituting values for x.

11. ✏️Expressions

    Writing an expression for a pattern or a sentence, deciding which expressions are equivalent, expanding brackets, and collecting like terms.

12. 🧱Factoring & Quadratics

    Factoring quadratic expressions (common factors, trinomials, difference of squares) and solving quadratic equations by factoring and square roots.

13. 🚀Exponents & Powers

    Evaluating powers, using the product, quotient and power laws, working with powers of products and fractions, and order of operations with exponents.

14. 🚀Linear or Exponential?

    Telling linear growth (add the same amount) from exponential growth (multiply by the same factor), writing exponential functions, and reading growth and decay rates.

15. 🔢Sequences

    Arithmetic and geometric sequences as functions: finding any term, writing a rule, and using a recursive rule.

16. 🔧Rearranging Formulas

    Rearranging a formula to solve for one quantity (d = rt for t, P = 2l + 2w for l) and using it, plus justifying each step in solving an equation.