Geometrical representation of a LE

Q.

Equation of a line through the origin and perpendicular to the line joining $\left(a,0\right)$ and $\left(-a,0\right)$ is

1. $y=0$

2. $x=0$

3. $a=–a$

4. $y=–a$

Q.

What is the graph of a linear equation in 2 variables?

1. straightline

2. sinewave

3. none of these

4. parabola

Q.

The point where the line $x+y=5$ touches the y-axis is (0, b) and where it touches the x-axis is (a, 0) ,

then a+b =

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Q.

The point (7, 3) falls on which of the following lines?

1. $x+3y=16$
2. $3y+2x=25$
3. $2x+7y=92$
4. $11y+2x=132$