Khan Academy

Solving systems of inequalities word problem (K-A)

Solving two-variable inequalities word problem (K-A)

Writing systems of inequalities word problem (K-A)

Writing two-variable inequalities word problem (K-A)

Classifying numbers: rational & irrational (K-A)

Intro to rational & irrational numbers (K-A)

Proof: product of rational & irrational is irrational (K-A)

Proof: sum & product of two rationals is rational (K-A)

Proof: sum of rational & irrational is irrational (K-A)

Sums and products of irrational numbers (K-A)

Worked example: rational vs. irrational expressions (K-A)

Worked example: rational vs. irrational expressions (unknowns) (K-A)

Proof: √2 is irrational (K-A)

Proof: square roots of prime numbers are irrational (K-A)

Proof: there's an irrational number between any two rational numbers (K-A)

Completing solutions to 2-variable equations (K-A)

Solutions to 2-variable equations (K-A)

Two-variable linear equations intro-video (K-A)

Worked example: solutions to 2-variable equations (K-A)

Intercepts from a table (K-A)

Intercepts from an equation (K-A)

Intercepts of lines review (x-intercepts and y-intercepts) (K-A)

Intro to intercepts (K-A)

x-intercept of a line (K-A)

Intro to slope (K-A)