# SSAT Upper Level Math : Lines

## Example Questions

### Example Question #6 : How To Find The Equation Of A Parallel Line

What line is parallel to  at ?

None of the answers are correct

Explanation:

Find the slope of the given line:  (slope intercept form)

therefore the slope is

Parallel lines have the same slope, so now we need to find the equation of a line with slope  and going through point  by substituting values into the point-slope formula.

So,

Thus, the new equation is

### Example Question #15 : How To Find The Equation Of A Parallel Line

If the line through the points (5, –3) and (–2, p) is parallel to the line y = –2x – 3, what is the value of p ?

11

17

4

0

10

11

Explanation:

Since the lines are parallel, the slopes must be the same. Therefore, (p+3) divided by (25) must equal 2. 11 is the only choice that makes that equation true. This can be solved by setting up the equation and solving for p, or by plugging in the other answer choices for p.

### Example Question #171 : Lines

Find the equation of the line that goes through the point  and is parallel to the line with the equation .

Explanation:

Because the two lines are parallel, we know that the slope of the line we need to find must also be .

We can then plug in the given point and the slope into the equation of a line to find the y-intercept.

Now, we can write the equation of the line.

### Example Question #172 : Lines

Find the equation of the line that passes through the point  and is parallel to the line with the equation .

Explanation:

Because the two lines are parallel, we know that the slope of the line we need to find must also be .

Now, we can plug in the point given by the question to find the y-intercept.

From this, we can write the following equation:

### Example Question #173 : Lines

Find the equation of the line that passes through the point  and is parallel to the line with the equation .

Explanation:

Because the two lines are parallel, we know that the slope of the line we need to find must also be .

Next, plug in the point given by the question to find the y-intercept of the line.

Now, we know that the equation of the line must be .

### Example Question #174 : Lines

Find the equation of the line that passes through the point  and is parallel to the line with the equation .

Explanation:

Because the two lines are parallel, we know that the slope of the line we need to find must also be .

Next, plug in the point given by the question to find the y-intercept of the line.

Now, we know the equation of the line must be .

### Example Question #175 : Lines

Find the equation of the line that passes through the point  and is parallel to the line with the equation .

Explanation:

Because the two lines are parallel, we know that the slope of the line we need to find must also be .

Next, plug in the point given by the question to find the y-intercept of the line.

Now, we can write the equation for the line:

### Example Question #176 : Lines

Find the equation of the line that passes through the point  and is parallel to the line with the equation .

Explanation:

Because the two lines are parallel, we know that the slope of the line we need to find must also be .

Next, plug in the point given by the question to find the y-intercept of the line.

Now, we knwo the equation of the line must be .

### Example Question #177 : Lines

Find the equation of the line that passes through the point  and is parallel to the line with the equation .

Explanation:

Because the two lines are parallel, we know that the slope of the line we need to find must also be .

Next, plug in the point given by the question to find the y-intercept of the line.

Thus, the equation of the line must be .

### Example Question #178 : Lines

Find the equation of the line that passes through the point  and is parallel to the line with the equation .