Question

What are the x and y-intercepts of the line described by the equation? −6x+3y=18.9

Answer 1

 -6x+3y=(189/10) Geometric figure: Straight Line  Slope = 2  x-intercept = -63/20 = -3.15000  y-intercept = 63/10 = 6.30000

Reformatting the input :

Changes made to your input should not affect the solution:

(1): "18.9" was replaced by "(189/10)".

Rearrange:

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

                     -6*x+3*y-((189/10))=0 

Step by step solution :Step  1  : 189 Simplify ——— 10 Equation at the end of step  1  : 189 (3y - 6x) - ——— = 0 10 Step  2  :Rewriting the whole as an Equivalent Fraction :

 2.1   Subtracting a fraction from a whole 

Rewrite the whole as a fraction using  10  as the denominator :

3y - 6x (3y - 6x) • 10 3y - 6x = ——————— = —————————————— 1 10

Equivalent fraction : The fraction thus generated looks different but has the same value as the whole 

Common denominator : The equivalent fraction and the other fraction involved in the calculation share the same denominator

Step  3  :Pulling out like terms :

 3.1     Pull out like factors :

   3y - 6x  =   -3 • (2x - y) 

Adding fractions that have a common denominator :

 3.2       Adding up the two equivalent fractions 
Add the two equivalent fractions which now have a common denominator

Combine the numerators together, put the sum or difference over the common denominator then reduce to lowest terms if possible:

-3 • (2x-y) • 10 - (189) -60x + 30y - 189 ———————————————————————— = ———————————————— 10 10 Step  4  :Pulling out like terms :

 4.1     Pull out like factors :

   -60x + 30y - 189  =   -3 • (20x - 10y + 63) 

Equation at the end of step  4  : -3 • (20x - 10y + 63) ————————————————————— = 0 10 Step  5  :When a fraction equals zero : 5.1    When a fraction equals zero ...

Where a fraction equals zero, its numerator, the part which is above the fraction line, must equal zero.

Now,to get rid of the denominator, Tiger multiplys both sides of the equation by the denominator.

Here's how:

-3•(20x-10y+63) ——————————————— • 10 = 0 • 10 10

Now, on the left hand side, the  10  cancels out the denominator, while, on the right hand side, zero times anything is still zero.

The equation now takes the shape :
   -3  •  (20x-10y+63)  = 0

Equations which are never true :

 5.2      Solve :    -3   =  0

This equation has no solution.
A a non-zero constant never equals zero.

Equation of a Straight Line

 5.3     Solve   20x-10y+63  = 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  20x-10y+63  = 0 and calculate its properties

Graph of a Straight Line : Calculate the Y-Intercept :

Notice that when x = 0 the value of y is 63/10 so this line "cuts" the y axis at y= 6.30000

  y-intercept = 63/10 = 6.30000 Calculate the X-Intercept :

When y = 0 the value of x is -63/20 Our line therefore "cuts" the x axis at x=-3.15000

  x-intercept = -63/20 = -3.15000 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 6.300 and for x=2.000, the value of y is 10.300. So, for a change of 2.000 in x (The change in x is sometimes referred to as "RUN") we get a change of 10.300 - 6.300 = 4.000 in y. (The change in y is sometimes referred to as "RISE" and the Slope is m = RISE / RUN)

  Slope = 2Geometric figure: Straight Line  Slope = 2  x-intercept = -63/20 = -3.15000  y-intercept = 63/10 = 6.30000