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1st problem : find the equation of the straight line having slope $m$ passing through the point $(a, 0)$. What are the coordinates of the point of intersection of this line with the y-axis?
2nd problem : find an equation of the line passing through the point $(1, 5)$ with a negative slope and forms with the coordinates axis a triangle with area $10$ sq. units. Please I want answers with steps.

Thank you!

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    ibrahim, please try to answer my question: what do you know about equations of lines?2012-11-09

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OP has gone to ground, but I find the second question shows some imagination, so I'll outline an answer. A line through $(1,5)$ has equation $y-5=m(x-1)$ for some $m$. When $x=0$, $y=5-m$; when $y=0$, $x=1-(5/m)$. The condition on the area of the triangle leads to $(1/2)(5-m)(1-(5/m))=10$ Clearing fractions, this is $(5-m)(m-5)=20m$ and from here it should be routine to solve.