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Mathematics
Amirah Oconnell
14 August, 19:29
How to I make 3x+6y=18 into y=my+b
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Raul Snyder
14 August, 20:27
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Step-by-step explanation:
3x+6y=18
Geometric figure: Straight Line
Slope = - 1.000/2.000 = - 0.500
x-intercept = 6/1 = 6.00000
y-intercept = 6/2 = 3
Rearrange:
Rearrange the equation by subtracting what is to the right of the equal sign from both sides of the equation:
3*x+6*y - (18) = 0
Step by step solution:
Step 1:
Pulling out like terms:
1.1 Pull out like factors:
3x + 6y - 18 = 3 • (x + 2y - 6)
Equation at the end of step 1:
Step 2:
Equations which are never true:
2.1 Solve : 3 = 0
This equation has no solution.
A a non-zero constant never equals zero.
Equation of a Straight Line
2.2 Solve x+2y-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+2y-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 3/1 so this line "cuts" the y axis at y = 3.00000
y-intercept = 6/2 = 3
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 3.000 and for x=2.000, the value of y is 2.000. So, for a change of 2.000 in x (The change in x is sometimes referred to as "RUN") we get a change of 2.000 - 3.000 = - 1.000 in y. (The change in y is sometimes referred to as "RISE" and the Slope is m = RISE / RUN)
Slope = - 1.000/2.000 = - 0.500
Geometric figure: Straight Line
Slope = - 1.000/2.000 = - 0.500
x-intercept = 6/1 = 6.00000
y-intercept = 6/2 = 3
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