Graphed points: ( 2,7 ) and ( -1, 1)

What is the system of equations shown in the graph?

A: { y = -x + 1
{ y = 2x + 7

B: { y = 2x - 3
{ y = 3x - 4

C: {y = 2x +3
{y = 3x + 4

D: { y = 3x + 2
{ y = 4x + 3

1 answer

To determine the correct system of equations based on the given points (2, 7) and (-1, 1), we need to find the equations of lines that pass through these points.

Let's first find the equation of the line that goes through the two points.

  1. Finding the slope (m):

Using the formula for the slope: \[ m = \frac{y_2 - y_1}{x_2 - x_1} \] where \((x_1, y_1) = (2, 7)\) and \((x_2, y_2) = (-1, 1)\): \[ m = \frac{1 - 7}{-1 - 2} = \frac{-6}{-3} = 2 \]

  1. Using point-slope form:

Using the point-slope form of the equation \(y - y_1 = m(x - x_1)\) with the point (2, 7): \[ y - 7 = 2(x - 2) \] Expanding this gives: \[ y - 7 = 2x - 4 \quad \Rightarrow \quad y = 2x + 3 \]

Now, we can also find the second line that should intersect the same points.

  1. Finding the second line

Using the point (−1, 1): Referencing \(y - 1 = m(x + 1)\) where we need to find the angle, we can assume that it will have a different slope. If we use the information we found earlier about the first line, we already know the slope is 2.

So we have: The first line is \(y = 2x + 3\) and now we also could guess a second line to intersect, starting from the y-intercept as such that it will create a system of two lines.

Upon analyzing the given options:

  • Option A has \(y = 2x + 7\) which doesn't match our derived line \(y = 2x + 3\).
  • Option B has \(y = 2x - 3\) which matches with \(2x\) but does not meet through the points.
  • Option C contains \(y = 3x + 4\) does not fulfill our points either.
  • Option D is incorrect too.

After checking, none of the answer choices seem to contain both correct lines simultaneously.

Thus, based on what we evaluated at the points:

  • The first equation we derived is \(y = 2x + 3\).

Thus it seems the given choices might have been misreferenced as typically it would be values intersecting and about to represented.

Nevertheless, for lines intersecting through the points with respect; double-check with the graphical representation of what was calculated -- for future references.

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