A Linear Equation is an equation for a straight line
e.g.: ax+by=c
Linear Function
Y=F(x)=ax+b
Intercepts and Slope
x-intercept and y-intercept can be found by setting x/y=0
slope:
Finding the Equation of a Line
Two-Point Form
m1=m2
y-y1/x-x1 = y2-y1/x2-x1
Point-Slope Form
When the line has slope & passes through point (x,y)
y-y0=m(x-x0)
Slope Intercept Form
When given point (0,y) and slope m:
y-b = m(x-0) , y= mx+b
Intersection of Straight Line
finding the point of intersection of two straight line
Parallel and perpendicular Line
Perpendicular Lines Two lines are Perpendicular if they meet at a right
angle (90°). How do we know if two lines are perpendicular? When we
multiply their slopes, we get −1