# display a function in y=mx+c

• Aug 5th 2012, 10:15 AM
leonm92
display a function in y=mx+c
 Given the function http://place32.placementtester.com:8...dpccloimlj.gif (i) Find the equation of the tangent to the function at the point x = 1 in the form http://place32.placementtester.com:8...phbibapenl.gif where m and c are numbers. Express m and c as whole numbers and not decimals Put in your expression for http://place32.placementtester.com:8...nophjdfkaa.gif
how can this be done?
• Aug 5th 2012, 10:31 AM
Prove It
Re: display a function in y=mx+c
Quote:

Originally Posted by leonm92
 Given the function http://place32.placementtester.com:8...dpccloimlj.gif (i) Find the equation of the tangent to the function at the point x = 1 in the form http://place32.placementtester.com:8...phbibapenl.gif where m and c are numbers. Express m and c as whole numbers and not decimals Put in your expression for http://place32.placementtester.com:8...nophjdfkaa.gif
how can this be done?

The tangent is a straight line, so will have a gradient and a y intercept.

You know a point that lies on the tangent, it's at x = 1 (what's the corresponding y value?)

How are you going to evaluate the gradient of the tangent at that point? Hint: It's the same as the gradient of your curve at that point...