# 10 Things You Should Know Before Taking Algebra | Summary and Q&A

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August 18, 2018
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The Organic Chemistry Tutor
10 Things You Should Know Before Taking Algebra

## TL;DR

Learn the key concepts in algebra, including slope calculation, graphing linear equations, writing linear equations, solving linear equations, understanding parallel and perpendicular lines, and simplifying algebraic expressions.

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### Q: How do you calculate the slope of a line given two points?

The slope (m) is equal to the difference in y-values divided by the difference in x-values: m = (y2 - y1) / (x2 - x1).

### Q: What is the slope-intercept form of a linear equation?

The slope-intercept form is y = mx + b, where m represents the slope and b represents the y-intercept.

### Q: How do you graph a linear equation in standard form?

Find the x-intercept and y-intercept by substituting 0 for the other variable. Plot these points and connect them with a line.

### Q: What is the point-slope formula for writing a linear equation?

The point-slope formula is y - y1 = m(x - x1), where (x1, y1) represents a point on the line and m represents the slope.

### Q: How do you find the slope of a perpendicular line?

Flip the fraction of the original slope and change the sign to get the slope of the perpendicular line.

### Q: What is the slope of a vertical line?

The slope of a vertical line is undefined because the denominator becomes 0, resulting in an undefined value.

### Q: How do you solve a linear equation by factoring?

Factor the equation into two binomials, set each binomial equal to 0, and solve for the variable.

### Q: What is the rule for simplifying expressions with negative exponents?

Move the variable with the negative exponent to the denominator and change the exponent to positive.

## Summary & Key Takeaways

• Calculate the slope of a line given two points using the formula: slope (m) = (y2 - y1) / (x2 - x1).

• Graph linear equations in slope-intercept form (y = mx + b) by identifying the slope (m) and y-intercept (b).

• Graph linear equations not in slope-intercept form by finding the x-intercept and y-intercept.

• Write linear equations using the point-slope formula: y - y1 = m(x - x1) and convert them to slope-intercept form.

• Understand parallel lines (same slope) and perpendicular lines (negative reciprocal slopes).

• Know the different slopes of horizontal, vertical, and lines with varying degrees of steepness.

• Solve linear equations by isolating the variable and using inverse operations.

• Simplify algebraic expressions by combining like terms and applying exponent rules.