review the Graphs of a system of two linear equation in two variables: x-5y=7 and 3x-2y=4. Find the solution to both equations

what is the intersection points

1 answer

To review the system of two linear equations and find the solution, we can write down the equations first:

  1. \( x - 5y = 7 \) (Equation 1)
  2. \( 3x - 2y = 4 \) (Equation 2)

Finding the Intersection Point

The solution (or intersection point) of these equations can be found using various methods such as substitution, elimination, or graphing. Here, I will use the substitution method.

Step 1: Solve the first equation for \( x \)

From Equation 1: \[ x = 5y + 7 \]

Step 2: Substitute \( x \) into the second equation

Now substitute \( x \) in Equation 2: \[ 3(5y + 7) - 2y = 4 \]

Expanding the equation: \[ 15y + 21 - 2y = 4 \] \[ 13y + 21 = 4 \]

Step 3: Solve for \( y \)

Now, isolate \( y \): \[ 13y = 4 - 21 \] \[ 13y = -17 \] \[ y = -\frac{17}{13} \]

Step 4: Substitute \( y \) back into the expression for \( x \)

Now plug \( y \) back into the expression for \( x \): \[ x = 5\left(-\frac{17}{13}\right) + 7 \] \[ x = -\frac{85}{13} + \frac{91}{13} \] \[ x = \frac{6}{13} \]

Intersection Point

The intersection point of the two equations, which is the solution to the system, is: \[ \left( \frac{6}{13}, -\frac{17}{13} \right) \]

Summary

  • The solution to the system of equations \( x - 5y = 7 \) and \( 3x - 2y = 4 \) is \( \left( \frac{6}{13}, -\frac{17}{13} \right) \). This point is where the two lines represented by the equations intersect on a graph.