math problems for trig.: linear functions, quadratic fcns

[helpplease!]

1) Find the particular equation of the linear function whose graph goes through the point (-3, 5) and is parallel to the graph of y=7x-13. Write the answer in slope intercept form.

2) Find the particular equation of the quadratic function containing the 3 points (1, 16), (2,15), and (4,1)

Thank you so much in advance if you can help me solve these!

 

[Deleted member 4993]

Re: math problems for trig. please help!

1) Find the particular equation of the linear function whose graph goes through the point (-3, 5) and is parallel to the graph of y=7x-13. Write the answer in slope intercept form.

What is the slope of the function?

What is the equation of the line with slope 'm' and going through a given point (x[sub:ehlalhp7]1[/sub:ehlalhp7],y[sub:ehlalhp7]1[/sub:ehlalhp7])

2) Find the particular equation of the quadratic function containing the 3 points (1, 16), (2,15), and (4,1)

Assume the equation to be:

f(x) = Ax[sup:ehlalhp7]2[/sup:ehlalhp7] + Bx + C

Please show us your work indicating exactly where you are stuck - so that we know where to begin to help you.

 

[stapel]

It's awkward that you're in trigonometry now (according to your subject line) and weren't taught these topics back in algebra. Ouch! :shock:

1) Find the particular equation of the linear function whose graph goes through the point (-3, 5) and is parallel to the graph of y=7x-13. Write the answer in slope intercept form.

To learn how to work this exercise, first learn about the slope of a straight line, and then about straight-line equations. Then you'll be able to follow the instructions provided in the "hints" in the previous reply. :wink:

2) Find the particular equation of the quadratic function containing the 3 points (1, 16), (2,15), and (4,1)

Following from the suggested starting point, note the form of the function for the quadratic. The three points give you three sets of x- and y-values that can be plugged into this function. So do that plug-n-chug. For instance, the first point will give you the following equation:

. . . . .\(\displaystyle 16\, =\, A\, +\, B\, +\, C\)

Once you have plugged the other two points into the same formula, you will have three linear equations in three variables (being A, B, and C). Solve the system to find the values of the coefficients in the function.

 

[helpplease!]

thank you for the help=]