Math Problem Statement

Find the x-intercept and the y-intercept of the graph of the equation: 3x + 5y = 30. The x-intercept is 10. What is the y-intercept?

Solution

The equation given is 3x+5y=303x + 5y = 30. We need to find both the x-intercept and the y-intercept.

1. X-intercept:

The x-intercept occurs when y=0y = 0. Substituting y=0y = 0 into the equation:

3x+5(0)=30    3x=30    x=303=103x + 5(0) = 30 \implies 3x = 30 \implies x = \frac{30}{3} = 10

Thus, the x-intercept is x=10x = 10, which is already provided in the image.

2. Y-intercept:

The y-intercept occurs when x=0x = 0. Substituting x=0x = 0 into the equation:

3(0)+5y=30    5y=30    y=305=63(0) + 5y = 30 \implies 5y = 30 \implies y = \frac{30}{5} = 6

Thus, the y-intercept is y=6y = 6.


Would you like more details on this? Here are some related questions for further exploration:

  1. What is the geometric meaning of the x- and y-intercepts?
  2. How would you graph the line using the intercepts?
  3. Can you rewrite the equation in slope-intercept form?
  4. What is the slope of the line in this equation?
  5. How would the intercepts change if the constants in the equation were different?

Tip: When solving for intercepts, remember that at the x-intercept, y=0y = 0, and at the y-intercept, x=0x = 0.

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Math Problem Analysis

Mathematical Concepts

Algebra
Linear Equations
Intercepts

Formulas

x-intercept: Set y = 0 in the equation
y-intercept: Set x = 0 in the equation

Theorems

Linear Equation Intercepts

Suitable Grade Level

Grades 7-9