What is the equation of the line (-4,0) and (0,5)
y=????

Question

What is the equation of the line (-4,0) and (0,5)
y=????

campbell_st · Answer

1st step is to find the slope... can you do that..?

anonymous · Answer

is it m=(y2-y1)/(x2-x1)?

campbell_st · Answer

thats it

so then use

y = mx + b

to find b, just substitute either point into the equation.

anonymous · Answer

ive gotten 0=(5/4)x-4+b    with b = -5
and 5=(5/4)x(0)+b     with b=5

anonymous · Answer

so is the answer y=(5/4)x+(-1)?

campbell_st · Answer

well is the slope is 5/4

use x = -4 and y = 0

so 

0 = 5/4 * (-4) + b
0 = -5 + b

so b = 5

then the equation is 

y = 5/4x + 5

anonymous · Answer

OHHH! so i would only need to substitute one equation instead of both?

directrix · Answer

You got 5/4 for the slope of the line. The line has both the two given points on it.

Choose one of them, say (0,5)

Use the point-slope fomat:

y - 5 = (5/4) (x - 0)

Simplify that.

directrix · Answer

(0,5) is the y intercept of the line.

You can also use the y = mx+b form.

Replace m with the slope 5/4 and b with 5 which is the y-intercept.

You'll get the same equation either way.  @dada6281

anonymous · Answer

You are a GENUIS @Directrix