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Graph 1 ⇒ Perpendicular

Graph 2 ⇒ Neither

Graph 3 ⇒ Parallel

Graph 4 ⇒ Neither

Step-by-step explanation:

Perpendicular lines: two lines intersected at a point and formed 4 right angles at this point.Parallel lines: two lines move in the same direction and never intersect each other.

Let us study each Graph

Graph 1:

∵ There are two intersected lines at a point

∴ They are not parallel

∵ The angles at the point of intersection are right angles

∴ The two lines are perpendicular

Graph 2:

∵ There are two intersected lines at a point

∴ They are not parallel

∵ The angles at the point of intersection are not right angles

∴ The two lines are not perpendicular

∴ The two lines are neither parallel nor perpendicular

Graph 3:

∵ The two lines not intersected at a point

∴ The two lines are not perpendicular

∵ They are in the same direction

∴ The two lines are parallel

Graph 4:

∵ The two lines not intersected at a point

∴ The two lines are not perpendicular

∵ They are NOT moved in the same direction

∴ The two lines are not parallel

∴ The two lines are neither parallel nor perpendicular

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Aand b are correctly balanced reactions. they have the same number of atoms in both sides of the reaction