Algebra 1 Homework Help for Kids and Teens
Although most students start learning algebraic reasoning in middle school or even earlier, it's common to take your first formal algebra course at the beginning of high school. Read on for an overview of some fundamental algebra concepts that may be introduced at this level.
Algebra Homework Help
Expressions, Equations and Inequalities
An expression represents an operation or set of operations, like (5 + 7) ÷ 4 or 4^3. Expressions may contain both numbers and variables. Equations state that the results of two expressions are equal, like 2(x + 3) = 2x + 6. When you solve equations by isolating the variable, you'll assume that both sides are equal. If there is no variable that can make the equation true, it's considered to have no solution.
Inequalities state that the result of one expression is greater than or less than the result of another. For example, 6x > 2x states that 6x is greater than 2x. If the inequality sign were underlined, this would indicate that 6x was greater than or equal to 2x.
Problem Solving and Graphing
In algebra, you'll use equations and inequalities to solve problems, and you'll represent those solutions graphically. For example, you might be given a problem like this one:
'Sam pays a tax rate of 20%, but he also gets a tax credit of $6,000. What is Sam's aftertax income if his gross income is $40,000? Graph an equation representing this problem.'
First, you'd represent this problem with an equation like this one: x  0.20x + 6,000 = y. The variable 'x' is Sam's gross income and 'y' represents his aftertax income. Since the question is asking about Sam's aftertax income when his gross income is $40,000, you can answer the question by plugging 40,000 in for 'x' and solving for 'y':
(40,000)  (40,000)(0.20) + 6,000 = y
y = 38,000
To answer the second part of the question, which asks you to graph the equation, you can employ one of two techniques. You can use the 'plug and chug' method, which means you plug in a few values for 'x' and solve for 'y.' This will generate a table of coordinate points. By plotting these points and drawing a line through them, you can identify the line representing the equation.
You can also manipulate the equation so that it's in slopeintercept form: y = mx + b. For equations in this form, 'm' is the slope of the line and 'b' is the line's yintercept (the point where it crosses the yaxis). To put x  0.20x + 6,000 = y in this form, simplify it to y = 0.80x + 6,000. The slope of 0.80 tells you that the line increases by 0.80 of a unit for every unit increase in the value of 'x,' and the yintercept of 6,000 tells you where the line intersects with the yaxis.
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