SUMMARY OF LINEAR EQUATIONS ...

ANONYMOUS - 17th August 2010
  1. Today we reconsidered the linear equation & the general form of a linear equation is y = mx + c
  2. where by the m refers to the GRADIENT
  3. where c is the Y-INTERCEPT (or the value of y when x = 0)
  4. m is POSITIVE when as x increases, y also increases
  5. m is NEGATIVE when as x increases, y will decrease
  6. m is ZERO when as x changes, y is constant (HORIZONTAL LINE)
  7. m is undefined when x is constant and y changes (VERTICAL LINE)
  8. X-INTERCEPT would be equal to -c / m ... (or the value of x when y = 0)
NOTE - c (or the constant in all the equation) is always the y-intercept, even for equations such as y = ax^2 + bx + c ...
Why do you think this is so? (HINT - look at point (3) above)

Prove point (8) for yourself ...

1 comment:

  1. NOTE - c (or the constant in all the equation) is always the y-intercept, even for equations such as y = ax^2 + bx + c ...
    Why do you think this is so? (HINT - look at point (3) above)
    .....
    Because x is 0 .
    Eg. y= a(0)^2 + h(0) + c = c
    y-intercept = (0,c)

    ReplyDelete