## Question

Is the point (2, –7) lie on origin side of the line 2*x* + *y *+ 2 = 0?

### Solution

*f*(2, –7) < 0

Let *f*(*x*, *y*) ≡ 2*x* + *y* + 2

* f*(2, –7) < 0 and constant 2 > 0

Hence the point (2, –7) lies on non-origin side.

#### SIMILAR QUESTIONS

Find the measure of the angle of intersection of the lines whose equations are 3*x* + 4*y* + 7 = 0 and 4*x* – 3*y* + 5 = 0.

Find the angle between the lines

where *a* > *b* > 0.

The slope of a straight line through *A*(3, 2) is 3/4. Find the coordinates of the points on the line that are 5 units away from *A*.

Find the direction in which a straight line must be drawn through the point (1, 2) so that its point of intersection with the line

*x* + *y* = 4 may be at a distance from this point.

Find the distance of the point (2, 3) from the line 2*x* – 3*y* + 9 = 0 measured along the line 2*x* – 2*y* + 5 = 0.

The line joining the points *A*(2, 0) and *B*(3, 1) is rotated about *A* in the anticlockwise direction through an angle of 15^{o}. Find the equation of the line in the new position. If *B* goes to *C* in the new position, what will be the coordinates of *C*?

The centre of a square is at the origin and one vertex is *A*(2, 1). Find the coordinates of other vertices of the square.

The extremities of the diagonal of a square are (1, 1), (–2, –1). Obtain the other two vertices and the equation of the other diagonal.

Are the points (2, 1) and (–3, 5) on the same or opposite side of the line 3*x* – 2*y* + 1 = 0?

A straight canal is at a distance of km from a city and the nearest path from the city to the canal is in the north-east direction. Find whether a village which is at 3 km north and 4 km east from the city lies on the canal or not. If not, then on which side of the canal is the village situated?