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Find the equation of the line …

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Find the equation of the line through the intersection of the lines 2x+3y-4=0 and x-5y=7 that has its intercept equal to -4.

  • 2 answers

Rashmi Bajpayee 8 years, 10 months ago

Since the family of lines passing through the intersection of given lines is

(2x + 3y - 4) k(x - 5y + 7) = 0

This line meets x-axis i.e. y = 0, then

2x - 4 + k(x - 5y + 9) = 0

x = (4 - 7k)/(2 + k), which is the x-intercept.

Therefore, -4 = (4 - 7k)/(2 + k)

k = 4

Putting the value of k in the family equation

(2x + 3y - 4) + 4(x - 5y + 7) = 0

6x - 17y + 24 = 0, which is the required equation

Naveen Sharma 8 years, 10 months ago

Ans. 2x + 3y - 4 = 0   => 2x +3y = 4      ........(1)

x - 5y = 7    ........(2)

First we need to find intersection of the lines, For that solve these equation for x and y 
multiply equation (2) by 2, We get 

2x - 10y = 14      ......(3)

Subtract (1) from (3), we get 
-13y = 10   => y = -1013

Put value of y in (1), we get  x = 4113
 
Let the Equation of line in intercept form is 
xa + yb = 1

as x intecept is -4  and point 4113,-1013 satisfies this equation.

putting all Values, we get

4113×-4 + -1013b = 1

=> -4152 - 1 = 1013b

=> 1013b = -9352

=> b = -4093

So the Equation of line ll be 

x-4 - 93y40 = 1

 

 

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