You are here:

Algebra/graphing etc

Advertisement


Question
A line passes through the point (-5,-8)  and has a slope of 4 . Write an equation for this line..

Also find the slope of 3x-4y=2

Answer
The equation for a line is y - y0 = m(x - x0).
We are given (x0,y0) = (-5,-8) and m=4, so this makes the equation be y + 8 = 4(x + 5).
As can be seen, (-5,-8) is a point on this curve and the slope is what is multiplied by x,
and that is 4.  This is since the multiple on y is 1.  This multiplies out to y + 8 = 4x + 20.  Getting the y by itself gives y = 4x + 12.

When put in the form of y = mx + b, m is the slope.
Adding -3x to both sides leaves only the y term on the left, and it is -4y = -3x + 2.
Dividing by -4 gives y by itself, and the answer is y = 3x/4 + 1/2.

Algebra

All Answers


Answers by Expert:


Ask Experts

Volunteer


Scott A Wilson

Expertise

Any algebraic question you've got. That includes question that are linear, quadratic, exponential, etc.

Experience

I have solved story problems, linear equations, parabolic equations. I have also solved some 3rd order equations and equations with multiple variables.

Publications
Documents at Boeing in assistance on the manufacturiing floor.

Education/Credentials
MS at math OSU in mathematics at OSU, 1986. BS at OSU in mathematical sciences (math, statistics, computer science), 1984.

Awards and Honors
Both my BS and MS degrees were given with honors.

Past/Present Clients
Students in a wide variety of areas since the 80's; over 1,000 of them have been in algebra.

©2016 About.com. All rights reserved.