Question

Help please...!

What is the slope-intercept form of the function that contains the point (–1, 5) and has a slope of –4?

y =____x +_____

Answer 1

@paki @phi @Compassionate ??? Some please help, I'll medal. (And fan unless I already have.)

Answer 2

the equation of a line

\[y-y _{1}=m(x-x _{1})\]

where your set of coordinates are
\[(-1,5)=(x _{1},y _{1})\]

Answer 3

m is the slope of the line

Answer 4

couldn't you just use y = mx + b ? subbing in -4 for m (slope) and your points and just solve for b, the y intercept ?

Answer 5

yeah you could

Answer 6

much simpler lol

Answer 7

So would it be..; 5=___-1=___? I'm so confused I don't understand.

Answer 8

you have y=mx+c for the standard equation of a line
you know y=5
x=-1
and m=-4

sub it in

5=-4(-1)+c
5=4+c
work out c

Answer 9

credit goes to @texaschic101

Answer 10

you could have used either formula and you would get the same answer

Answer 11

Okay so.. 5=-4+c and I'll solve it and can you check it for me?

Answer 12

Blah typo oh well

Answer 13

what did you get ?

Answer 14

I got 1?

Answer 15

well done

Answer 16

so your equation is : y = -4x + 1....because that number you just solved for was the y intercept

Answer 17

and you already knew the slope (m) was -4

Answer 18

Oh okay! I sorta get it all now, thank you both!! :D

Answer 19

:)