What are the values of a and b in this vector equation?

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Homework Help Overview

The discussion revolves around a vector equation involving two unknowns, a and b, in the context of vector addition. The original poster presents the equation a\vec{A}+ b\vec{B} + \vec{C} = 0, with specific vector values provided.

Discussion Character

  • Exploratory, Problem interpretation, Assumption checking

Approaches and Questions Raised

  • Participants explore the setup of the vector equation and discuss the implications of having two equations with two unknowns. There are inquiries about how to approach solving the system of equations, with some participants reflecting on the concept of resultant vectors.

Discussion Status

The discussion is ongoing, with participants seeking clarification on how to solve the equations. Some guidance has been offered regarding the nature of the equations, but no consensus or specific methods have been established yet.

Contextual Notes

There appears to be uncertainty regarding the initial steps to take in solving the vector equation, as well as a lack of familiarity with solving simultaneous equations among some participants.

renncat2
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Let a[itex]\vec{A}[/itex]+ b[itex]\vec{B}[/itex] + [itex]\vec{C}[/itex] = 0, where [itex]\vec{A}[/itex] = (75, -60), [itex]\vec{B}[/itex] = (-16, 60), and [itex]\vec{C}[/itex] = (84,16). I need to find the value of a and b. I really have no idea where to start with this problem any help would be great!
 
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renncat2 said:
Let a[itex]\vec{A}[/itex]+ b[itex]\vec{B}[/itex] + [itex]\vec{C}[/itex] = 0, where [itex]\vec{A}[/itex] = (75, -60), [itex]\vec{B}[/itex] = (-16, 60), and [itex]\vec{C}[/itex] = (84,16). I need to find the value of a and b. I really have no idea where to start with this problem any help would be great!
Welcome to Physics Forums.

You have two equations, with two unknowns. How do you suppose you could solve them?
 
So far I found the magnitude of the resultant displacement. (Rx = 144, Ry = 16, [itex]\vec{R}[/itex] = 144.886)
 
renncat2 said:
So far I found the magnitude of the resultant displacement. (Rx = 144, Ry = 16, [itex]\vec{R}[/itex] = 144.886)
The magnitude of the resultant vector is zero, by definition.

How do you normally solve systems of simultaneous equations?
 
i don't know. can you give me an example?
 

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