Find the solution to the system of equations using the …

Mathematics Questions

Find the solution to the system of equations using the interactive graph below: y = x – 4 and y = 4x + 2.

Short Answer

To solve the system of equations y = x – 4 and y = 4x + 2, first set them equal to each other, resulting in x – 4 = 4x + 2. After solving for x, you find x = -1.5, and substituting this value back into one of the original equations gives y = -5.5, leading to the intersection point (-1.5, -5.5).

Step-by-Step Solution

Step 1: Set the Equations Equal

Start by writing down the two equations that you want to solve: y = x – 4 and y = 4x + 2. Since both equations equal y, you can set them equal to each other to find their intersection point. This gives you the equation:

  • x – 4 = 4x + 2

Step 2: Solve for x

Next, simplify the equation you created in Step 1 to solve for x. Rearranging the equation, you get:

  • x – 4 – 4x = 2
  • -3x – 4 = 2
  • -3x = 6
  • x = -1.5

At this point, you have found x.

Step 3: Substitute to Find y

To find the corresponding value of y, substitute x = -1.5 back into one of the original equations. Using y = x – 4, replace x with -1.5, which results in:

  • y = -1.5 – 4
  • y = -5.5

Therefore, the solution to the system of equations is the point (-1.5, -5.5).

Related Concepts

Equations

A mathematical statement that asserts the equality of two expressions, often involving variables that can be solved for their values.

Intersection Point

The point where two or more graphs meet or cross, representing common solutions to the equations involved.

Substitution

A method for solving equations by replacing a variable with a known value or expression in order to simplify and solve for another variable.

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