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Graph the inequality
4x-12y<24
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User Ronald Blaschke
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1 Answer

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16 votes

Answer:

Slope = 0.667/2.000 = 0.333

x-intercept = 6/1 = 6.00000

y-intercept = 6/-3 = 2/-1 = -2.00000

Explanation:

Rearrange:

Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation :

4*x-12*y-(24)=0

Step 1: Pulling out like terms

Pull out like factors :

4x - 12y - 24 = 4 • (x - 3y - 6)

Equation at the end of step 1:

Step 2:

Equations which are never true:

Solve : 4 = 0

This equation has no solution.

A a non-zero constant never equals zero.

Equation of a Straight Line

Solve x-3y-6 = 0

Tiger recognizes that we have here an equation of a straight line. Such an equation is usually written y=mx+b ("y=mx+c" in the UK).

"y=mx+b" is the formula of a straight line drawn on Cartesian coordinate system in which "y" is the vertical axis and "x" the horizontal axis.

In this formula :

y tells us how far up the line goes

x tells us how far along

m is the Slope or Gradient i.e. how steep the line is

b is the Y-intercept i.e. where the line crosses the Y axis

The X and Y intercepts and the Slope are called the line properties. We shall now graph the line x-3y-6 = 0 and calculate its properties

Graph of a Straight Line :

Calculate the Y-Intercept :

Notice that when x = 0 the value of y is 2/-1 so this line "cuts" the y axis at y=-2.00000

y-intercept = 6/-3 = 2/-1 = -2.00000

Calculate the X-Intercept :

When y = 0 the value of x is 6/1 Our line therefore "cuts" the x axis at x= 6.00000

x-intercept = 6/1 = 6.00000

Calculate the Slope :

Slope is defined as the change in y divided by the change in x. We note that for x=0, the value of y is -2.000 and for x=2.000, the value of y is -1.333. So, for a change of 2.000 in x (The change in x is sometimes referred to as "RUN") we get a change of -1.333 - (-2.000) = 0.667 in y. (The change in y is sometimes referred to as "RISE" and the Slope is m = RISE / RUN)

Slope = 0.667/2.000 = 0.333

Geometric figure: Straight Line

Slope = 0.667/2.000 = 0.333

x-intercept = 6/1 = 6.00000

y-intercept = 6/-3 = 2/-1 = -2.00000

User NewbieMACuser
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