Math Problem Statement

3x + 4y = 7

Solution

The equation given is a linear equation in two variables, xx and yy. We can analyze and solve it in several ways:

1. Solving for One Variable

If you want to express one variable in terms of the other, you can solve for either xx or yy.

Solving for xx: 3x+4y=73x + 4y = 7 3x=74y3x = 7 - 4y x=74y3x = \frac{7 - 4y}{3}

Solving for yy: 3x+4y=73x + 4y = 7 4y=73x4y = 7 - 3x y=73x4y = \frac{7 - 3x}{4}

2. Finding the Intercepts

To find where the line intersects the axes:

  • x-intercept: Set y=0y = 0. 3x+4(0)=7    x=733x + 4(0) = 7 \implies x = \frac{7}{3}

  • y-intercept: Set x=0x = 0. 3(0)+4y=7    y=743(0) + 4y = 7 \implies y = \frac{7}{4}

So, the intercepts are (73,0)(\frac{7}{3}, 0) and (0,74)(0, \frac{7}{4}).

3. Graphing the Equation

The equation represents a straight line. You can plot the points found (intercepts) and draw a line through them.

4. General Form

The equation 3x+4y=73x + 4y = 7 is already in the standard linear form Ax+By=CAx + By = C, where A=3A = 3, B=4B = 4, and C=7C = 7.

5. Slope-Intercept Form

To find the slope and y-intercept, rewrite the equation in the form y=mx+by = mx + b:

4y=3x+7    y=34x+744y = -3x + 7 \implies y = -\frac{3}{4}x + \frac{7}{4}

Here, the slope (mm) is 34-\frac{3}{4} and the y-intercept (bb) is 74\frac{7}{4}.


Would you like more details on any of these methods, or do you have any other questions?

Related Questions:

  1. How do you find the slope of a line between two points?
  2. What is the standard form of a linear equation?
  3. How do you determine if two lines are parallel or perpendicular?
  4. How can we solve a system of linear equations?
  5. What are different methods to graph a linear equation?

Tip: Understanding different forms of linear equations helps to solve and graph them efficiently!

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Math Problem Analysis

Mathematical Concepts

Linear Equations
Algebra
Graphing

Formulas

Standard form: Ax + By = C
Slope-intercept form: y = mx + b

Theorems

Slope formula
Intercepts of a linear equation

Suitable Grade Level

Grades 8-10