Math Problem Statement

y= 3x-4 and y= 1/2x+3

Solution

You have two equations:

  1. y=3x4y = 3x - 4
  2. y=12x+3y = \frac{1}{2}x + 3

To find the solution to this system of equations, we can set the two expressions for yy equal to each other because both equations equal yy:

3x4=12x+33x - 4 = \frac{1}{2}x + 3

Steps to Solve:

  1. Remove the fraction: Multiply through by 2 to eliminate the denominator.

    2(3x4)=2(12x+3)2(3x - 4) = 2\left(\frac{1}{2}x + 3\right)

    Simplifying:

    6x8=x+66x - 8 = x + 6

  2. Isolate terms involving xx: Move all xx-terms to one side and constants to the other.

    Subtract xx from both sides:

    6xx8=66x - x - 8 = 6

    Simplifying:

    5x8=65x - 8 = 6

  3. Solve for xx: Add 8 to both sides:

    5x=145x = 14

    Now divide by 5:

    x=145orx=2.8x = \frac{14}{5} \quad \text{or} \quad x = 2.8

  4. Substitute x=2.8x = 2.8 into one of the original equations: Let's use y=3x4y = 3x - 4.

    y=3(2.8)4y = 3(2.8) - 4

    y=8.44y = 8.4 - 4

    y=4.4y = 4.4

Final Solution:

The solution to the system of equations is:

x=2.8,y=4.4x = 2.8, \quad y = 4.4

If you need any further details or have questions, feel free to ask!

Related Questions:

  1. How would you solve a system of equations by substitution instead of elimination?
  2. What is the graphical interpretation of the solution to a system of linear equations?
  3. How can you check if a given solution satisfies both equations in a system?
  4. How does the method of elimination work when dealing with systems of linear equations?
  5. What is the general formula for solving systems of linear equations using matrices?

Tip:

When solving systems of linear equations, it's helpful to either graph the lines or manipulate the equations algebraically to find where they intersect.

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Math Problem Analysis

Mathematical Concepts

Systems of Linear Equations
Algebra
Solving Equations

Formulas

y = mx + b
Solving systems of equations (substitution or elimination)

Theorems

The intersection of two lines represents the solution to the system of equations.

Suitable Grade Level

Grades 7-9