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Let equation of line is <br> `(x)/(a)+(y)/(a)=1` <br> Since, this the passes through `(1-2)`. <br> `(1)/(a)+(2)/(a)=1` <br> `rArr1-2=arArra=-1` <br> `therefore` Required equation of the line is <br> `-x-y=1` <br> `rArrx+y+1=0`**Theorem :-Every first degree equation in x,y represents a straight line.**

**Find the slope of a line when two points having coordinates are given ?**

**Find the slope of a line having equation of the form `ax+by+c=0`**

**Find the angles between two lines .**

**Examples :(i) Let A(6,4) and B(2,12) be two given points.Find the slope of the line perpendicular to AB. (ii) If line `3x-ay-1=0` is parallel to the line `(a-2)x-y+3=0` then find the values of a.**

**Condition for the parallelism of two lines.**

**Condition for Perpendicularity of two lines .**

**What is the intercept of a line on x- axis and y-axis ?**

**Equation of line parallel to x and y axis**

**Slope-intercept form of a line**