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What’s the slope of 2y=-4x+2

2 Answers

2 votes

Answer: m = 2

Explanation:

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

2*y-(4*x-2)=0

STEP 1

Pulling out like terms

1.1 Pull out like factors :

2y - 4x + 2 = 2 • (y - 2x + 1)

Equation at the end of step

STEP 2

Equations which are never true:

2.1 Solve : 2 = 0

This equation has no solution.

A a non-zero constant never equals zero.

Equation of a Straight Line

2.2 Solve y-2x+1 = 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 y-2x+1 = 0 and calculate its properties

Graph of a Straight Line :

Calculate the Y-Intercept :

Notice that when x = 0 the value of y is -1/1 so this line "cuts" the y axis at y=-1.00000

y-intercept = -1/1 = -1.00000

Calculate the X-Intercept :

When y = 0 the value of x is 1/2 Our line therefore "cuts" the x axis at x= 0.50000

x-intercept = 1/2 = 0.50000

User Valkea
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2y=-4x+2\implies y=\cfrac{-4x+2}{2} \\\\\\ y=\cfrac{-4x}{2}+\cfrac{2}{2}\implies y=\stackrel{\stackrel{\textit{\small slope}}{\downarrow }}{-2} x+1\qquad \impliedby \begin{array} \cline{1-1} slope-intercept~form\\ \cline{1-1} \\ y=\underset{y-intercept}{\stackrel{slope\qquad }{\stackrel{\downarrow }{m}x+\underset{\uparrow }{b}}} \\\\ \cline{1-1} \end{array}

User Danprice
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