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Three lines 3x+5 y=15,6x -5y=30 and …

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Three lines 3x+5 y=15,6x -5y=30 and x=0 are enclosing a beautiful triangular park .Find the points of intersection of lines and the area of the park if all measurements are in km
  • 1 answers

Sia ? 5 years, 3 months ago

{tex}x - y - 5 = 0{/tex}
{tex}\Rightarrow y = x - 5{/tex}

x 2 5
y -3 0

{tex}3x + 5y - 15 = 0{/tex}
{tex}\Rightarrow y = \frac { 15 - 3 x } { 5 }{/tex}

x 0 5
y 3 0


Thus, the two graph lines intersect at {tex}(5, 0){/tex}
{tex}\therefore{/tex}  {tex}x = 5\ and\ y = 0{/tex} is the solution of given system of equations

The vertices of the triangle formed by these lines and y - axis are {tex}(5, 0), (0, 3)\ and\ (0, -5){/tex}
So, height of the triangle
= distance from (5, 0) to x-axis
= {tex}5\ units{/tex}
Base = {tex}8\ units{/tex}
Area of the triangle = {tex}\frac { 1 } { 2 } \times \text { base } \times \text{height}{/tex}
{tex}= \frac { 1 } { 2 } \times 8 \times 5{/tex}
= {tex}20\ sq. units{/tex}

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