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A coordinate plane with four quadrants shows the x- and y-axes ranging from negative 5 to 5 in increments of 1. A solid line and a dotted line intersect each other. The equation of the solid line is x minus 5 y equals 3. The equation of the dotted line is 3 x minus 2 y equals negative 4. The intersection of both lines is shown at negative 2 on the x-axis and negative 1 on the y-axis in quadrant 3.

Review the graphs of a system of two linear equations in two variables: x−5y=7
and 3x−2y=−4
. Find the solution to both equations.

(1 point)
The intersection point is

1 answer

To find the solution to the system of equations \( x - 5y = 7 \) and \( 3x - 2y = -4 \), we need to solve these equations simultaneously.

  1. Start with the first equation: \[ x - 5y = 7 \] Rearranging for \( x \): \[ x = 5y + 7 \]

  2. Substitute \( x \) into the second equation: \[ 3x - 2y = -4 \] Replacing \( x \) with \( 5y + 7 \): \[ 3(5y + 7) - 2y = -4 \] This simplifies to: \[ 15y + 21 - 2y = -4 \] \[ 13y + 21 = -4 \] \[ 13y = -4 - 21 \] \[ 13y = -25 \] \[ y = -\frac{25}{13} \]

  3. Substituting back to find \( x \): Using \( y = -\frac{25}{13} \) in \( x = 5y + 7 \): \[ x = 5\left(-\frac{25}{13}\right) + 7 \] \[ x = -\frac{125}{13} + 7 \] Convert \( 7 \) into a fraction: \[ x = -\frac{125}{13} + \frac{91}{13} \] \[ x = -\frac{125 - 91}{13} = -\frac{34}{13} \]

  4. Final intersection point: The intersection point is given by: \[ \left(-\frac{34}{13}, -\frac{25}{13}\right) \]

Thus, the intersection point is (-34/13, -25/13).