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the equation of line L is y=5x+1

Sagot :

Consider the complete question is "The equation of the line [tex]L_1[/tex] is y=5x+1 and the equation of line [tex]L_2[/tex] is 2y-10x+3=0. How can you show that these two lines are parallel?"

Given:

Equation of [tex]L_1[/tex] is [tex]y=5x+1[/tex].

Equation of [tex]L_2[/tex] is [tex]2y-10x+3=0[/tex].

To show:

The these line as parallel.

Solution:

We have,

[tex]y=5x+1[/tex]        ...(i)

[tex]2y-10x+3=0[/tex]      ...(ii)

Equation (ii) can be written as

[tex]2y=10x-3[/tex]

[tex]y=\dfrac{10x-3}{2}[/tex]

[tex]y=\dfrac{10x}{2}-\dfrac{3}{2}[/tex]

[tex]y=5x-\dfrac{3}{2}[/tex]           ...(iii)

Slope intercept form of a line is

[tex]y=mx+b[/tex]          ...(iv)

where, m is slope and b is y-intercept.

On comparing (i) with (iv), we get slope of line [tex]L_1[/tex].

[tex]m_1=5[/tex]

On comparing (iii) with (iv), we get slope of line [tex]L_2[/tex].

[tex]m_2=5[/tex]

Since, [tex]m_1=m_2[/tex], therefore, lines [tex]L_1[/tex] and [tex]L_2[/tex] and parallel because slope of two parallel lines are always equal.

Hence proved.