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Sagot :
Answer:
[tex]y=-\dfrac{2}{3} x+\dfrac{23}{3}[/tex]
Step-by-step explanation:
Parallel Lines
Recall that parallel lines share the same slope value.
Geometric Reasoning
Graphing two lines of the same slope and different y-intercepts produces two lines that never intersects. (Try it out on either a physical or digital graphing calculator!)
Algebraic Reasoning
Another this can be explained is by imagining a systems of equations. If two lines are parallel, they shouldn't have a solution. If we have say the equations [tex]y=2x+5[/tex] and [tex]y=2x+10[/tex], using substitution to solve the system we'd get,
[tex]2x+10=2x+5\\2x-2x=5-10\\0x=-5[/tex] ,
which there is no possible x value that can make the last equation true, thus no solutions.
So, from this example this confirms that two lines with the same slope regardless of their y-intercepts will have no solutions, implying that they're parallel.
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Applying what we know, if the line in this problem is parallel to the line [tex]y=-\dfrac{2}{3} x+3[/tex], then our new line must also have a slope of [tex]-\dfrac{2}{3}[/tex]!
Recalling the general format of a linear equation, [tex]y=mx+b[/tex], where in our case, y and x stays unchanged, and m is already found, all there's left is to find the y-intercept or b value.
How can we do that?
Knowing that a coordinate pair is given to us that's on our new line or is a solution to our line (plugging in the x-coordinate into the new line's equation produces its y-coordinate), we can plug their x and y values into our tentative equation, rearrange and solve for b!
[tex]3=-\dfrac{2}{3} (7)+b[/tex]
[tex]3=-\dfrac{14}{3}+b[/tex]
[tex]3+\dfrac{14}{3}=b[/tex]
[tex]\dfrac{9}{3} +\dfrac{14}{3} \\\implies \dfrac{23}{3} =b\\[/tex]
Now the linear equation of our new line is complete!
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