Algebra · real student question

Which of these equations represents a line parallel to y = 4x − 5? y = 4x + 7, y = −(1/4)x + 6, y = (3/4)x + 1, or y = (3/2)x − 5.

Question

Which of the following equations represents a line parallel to y=4x5y=4x-5?

y=4x+7,y=14x+6,y=34x+1,y=32x5y=4x+7,\qquad y=-\frac14x+6,\qquad y=\frac34x+1,\qquad y=\frac32x-5

Step-by-step solution

  1. State the criterion. Two distinct lines are parallel exactly when they have the same slope and different intercepts. The yy-intercept plays no role in deciding parallelism, so the entire question reduces to comparing slopes.

  2. Read the slope of the given line. In slope-intercept form y=mx+by=mx+b, the slope is the coefficient of xx:

    y=4x5m=4y=4x-5\quad\Longrightarrow\quad m=4

  3. Read the slope of each option. All four are already in slope-intercept form:

    y=4x+7m=4;y=14x+6m=14;y=34x+1m=34;y=32x5m=32y=4x+7\Rightarrow m=4;\quad y=-\tfrac14x+6\Rightarrow m=-\tfrac14;\quad y=\tfrac34x+1\Rightarrow m=\tfrac34;\quad y=\tfrac32x-5\Rightarrow m=\tfrac32

  4. Select the match. Only the first has slope 44:

    y=4x+7\boxed{y=4x+7}

  5. Confirm it is parallel and not the same line. Its intercept 77 differs from 5-5, so the two lines are distinct and never meet — setting 4x5=4x+74x-5=4x+7 gives 5=7-5=7, a contradiction, confirming no intersection.

  6. Note the deliberate distractor. The option y=14x+6y=-\tfrac14x+6 has slope 14-\tfrac14, the negative reciprocal of 44, so that line is perpendicular to the given line, not parallel. Mixing up mm and 1/m-1/m is the intended trap.

Answer

y=4x+7y=4x+7

Need to solve a different problem like this? Open the solver →