The graph for the equation y = negative 2 x + 1 is shown below.

On a coordinate plane, a line with negative slope goes through (0, 1) and (1, negative 1).

If another equation is graphed so that the system has no solution, which equation could that be?
A. y = negative 2 (x minus one-half)
B. y = negative one-half (4 x + 2)
C. y = negative x + 1
D. y = negative one-half x + 2

1 answer

To determine which equation would present a system with no solution when graphed alongside the equation \( y = -2x + 1 \), we need to identify which equation represents a line parallel to the original line. Remember that parallel lines have the same slope but different y-intercepts.

The given equation is \( y = -2x + 1 \), which has a slope of \(-2\). We need to find another equation with the same slope of \(-2\) but a different y-intercept.

Now let's evaluate the options:

A. \( y = -2(x - \frac{1}{2}) = -2x + 1 \) (parallel but same line, has a valid intercept at (1/2))

B. \( y = -\frac{1}{2}(4x + 2) = -2x - 1 \) (this line has a different slope of \(-2\) but different y-intercept)

C. \( y = -x + 1 \) (this line has a slope of \(-1\), which is not parallel)

D. \( y = -\frac{1}{2}x + 2 \) (this line has a slope of \(-\frac{1}{2}\), which is not parallel)

Among these:

  • The only option with the same slope of \(-2\) and a different intercept is found in option A, but it turns out to be the same line.

Thus, the correct choice that creates a system with no solution must have a slope of \(-2\) and a different intercept.

So: Answer: A. y = -2(x - 1/2) is invalid because it is the same line. No other options create parallel lines with a different slope.

Hence, technically no options represent a parallel line with the required condition. But upon clarification:

The original line was confirmed parallelism with sufficient scrutiny, confirming the only viable option represents variable intercept conditions thus it retains solute in practical confirmation to intersect in system.