Most useful form of straight-line equations is the "slope-intercept" form:
y = m x + b
This is called the slope-intercept form because "m" is the slope and "b" gives the y - intercept
y - intercept = value of y when x = 0
In this case :
y = x + 2
slope = 1
y - intercept = 0 + 2 = 2
y = x + 2 = 0
x = - 2
This point is called x - intercept
value of x when y = 0
what is the slope and y intercept of this equation?
x+2=0
2 answers
eh? The equation was x+2=0
It is a vertical line at x = -2, and has no y-intercept!
It is a vertical line at x = -2, and has no y-intercept!