Math Problem Statement

Find the x- and y-intercepts of the graph of -8x + 7y = 40. State each answer as an integer or an improper fraction in simplest form.

Solution

To find the x- and y-intercepts of the equation:

8x+7y=40-8x + 7y = 40

we'll solve for each intercept by setting the other variable to zero.

Finding the x-intercept:

The x-intercept occurs where y=0y = 0.

  1. Substitute y=0y = 0 into the equation: 8x+7(0)=40-8x + 7(0) = 40 8x=40-8x = 40

  2. Solve for xx: x=408=5x = \frac{40}{-8} = -5

So, the x-intercept is (5,0)(-5, 0).

Finding the y-intercept:

The y-intercept occurs where x=0x = 0.

  1. Substitute x=0x = 0 into the equation: 8(0)+7y=40-8(0) + 7y = 40 7y=407y = 40

  2. Solve for yy: y=407y = \frac{40}{7}

So, the y-intercept is (0,407)\left(0, \frac{40}{7}\right).

Final Answer:

  • x-intercept: 5-5
  • y-intercept: 407\frac{40}{7}

Would you like more details on intercepts or have any further questions?

Here are some related questions to expand your understanding:

  1. How do you find the slope of a line given in standard form, such as 8x+7y=40-8x + 7y = 40?
  2. What is the process to convert an equation in standard form to slope-intercept form?
  3. Can you find the distance between the x- and y-intercepts of this line?
  4. How does the standard form of a line help identify intercepts?
  5. What would the intercepts be if the constant term on the right side of the equation was changed?

Tip: To quickly find intercepts, remember that setting y=0y = 0 finds the x-intercept and setting x=0x = 0 finds the y-intercept.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Intercepts

Formulas

Ax + By = C (standard form of a linear equation)

Theorems

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Suitable Grade Level

Grades 8-10