Using a T! 89 - point slope form if m = -2 and passes through (3,4) find the equation of the line.

Question

jim_thompson5910 · Answer

Point slope form
$$\Large y - y_1 = m(x-x_1)$$

Make the proper substitutions to get
$$\Large y - 4 = -2(x-3)$$

now solve for y

jim_thompson5910 · Answer

now type in `solve(y-4=-2*(x-3),y)` to have the TI-89 solve for y. You'll have to do a slight rearrangement to get it into y = mx+b form

jim_thompson5910 · Answer

the `solve(` function is found by hitting F2 in the home screen (to get the "algebra" menu)

anonymous · Answer

when I try that it gives me an err: dimension.

jim_thompson5910 · Answer

because you made x and y be defined based on those matrices we were working with earlier (which is my fault)

jim_thompson5910 · Answer

what you have to do is clear the RAM memory to free up x and y

jim_thompson5910 · Answer

2nd key ---> 6 to bring up the MEM screen

hit F1 and reset the RAM only (all RAM)
do not touch the ROM at all because that's where the APPs are stored