Math Is Fun Forum

jxharmon

Member

Registered: 2007-01-08

Posts: 104

Equation ?

How do I write an equation of the line with slope -2 and y-intercept (0,0)?

would it be
y=-2x or y= x -2

mathsyperson

Moderator

Registered: 2005-06-22

Posts: 4,900

Re: Equation ?

The first one is correct. The slope determines the coefficient that goes before the x term and the y-intercept determines the constant term.

Basically, a line with slope a and y-intercept (0,b) will have the equation y = ax+b.

---

Why did the vector cross the road?
It wanted to be normal.

littlelittle

Member

Registered: 2007-01-24

Posts: 10

Re: Equation ?

Hi

How did you solve this problem.  Can you explain it stepwise pl.

Thanks
S

Monox D. I-Fly

Member

From: Indonesia

Registered: 2015-12-02

Posts: 2,000

Re: Equation ?

Hi

How did you solve this problem.  Can you explain it stepwise pl.

Thanks
S

It's just as mathyperson said.
Since the line in question has slope -2 and y-intercept (0,0), so a = -2 and b = 0. Substitute them to the y = ax + b equation and you have:
y = ax + b
y = -2x + 0
y = -2x

---

Actually I never watch Star Wars and not interested in it anyway, but I choose a Yoda card as my avatar in honor of our great friend bobbym who has passed away.
May his adventurous soul rest in peace at heaven.