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what is the equation for the graph below? A y = − (x − 3)2 + 1B y = − (x + 3)2 + 1C y = (x − 3)2 − 1D y = (x + 3)2 − 1

What Is The Equation For The Graph Below A Y X 32 1B Y X 32 1C Y X 32 1D Y X 32 1 class=

Sagot :

Solution

Notice that the graph passes through the two points (0,2) and (-2,8)

The equation of the straight line graph will be of the form

[tex]y=mx+c[/tex]

Where m is the slope and c is the y - intercept

We will first the slope first

[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex][tex]\begin{gathered} x_1=0 \\ y_1=2_{} \\ x_2=-2 \\ y_2=8 \end{gathered}[/tex][tex]\begin{gathered} m=\frac{y_2-y_1}{x_2-x_1} \\ m=\frac{8-2}{-2-0} \\ m=\frac{6}{-2} \\ m=-3 \end{gathered}[/tex]

Thus,

[tex]y=-3x+c[/tex]

Recall that c is the y - intercept and the y - intercept is at 2

Thus,

[tex]c=2[/tex][tex]y=-3x+2[/tex]

We will now consider the options to see which gives the above equation

Option A

[tex]\begin{gathered} y+1=-3(x-1) \\ y+1=-3x+3 \\ y=-3x+3-1 \\ y=-3x+2 \end{gathered}[/tex]

Therefore, Option A is Correct