Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

Pages: **1**

**x1000uf****Member**- Registered: 2006-02-26
- Posts: 1

i dont know how to do it with factions someone help??!!!!

im gonna fail becuase i dont know how to do it

y-9=2/5(x+20

Offline

**MathsIsFun****Administrator**- Registered: 2005-01-21
- Posts: 7,626

What was the actual question? How to simplify y-9=2/5(x+20 ) ?

"The physicists defer only to mathematicians, and the mathematicians defer only to God ..." - Leon M. Lederman

Offline

**ganesh****Moderator**- Registered: 2005-06-28
- Posts: 21,307

I guess the question is finding the equation of a straight line whose slope is 2/5 and which passes through the point (-20, 9).

The equation of a straight line passing through a given point (x1, y1) and with a given slope, m, is

y - y1 = m(x - x1).

In the given problem, x1 = -20, y1=9 and m=2/5.

Therefore, the equation of the straight line is

y-9 = 2/5[(x+20)]

5y-45 = 2x + 40

5y - 2x = 85

2x - 5y + 85 = 0 is the required equation.

It is no good to try to stop knowledge from going forward. Ignorance is never better than knowledge - Enrico Fermi.

Nothing is better than reading and gaining more and more knowledge - Stephen William Hawking.

Offline

**krassi_holmz****Real Member**- Registered: 2005-12-02
- Posts: 1,905

or y=(2x+85)/5?

IPBLE: Increasing Performance By Lowering Expectations.

Offline

Pages: **1**