Find the solution to the following system of equations using matrices: 2x+6y=3 -5x+y=4

R1 ÷ 2  =

R2 ÷ -5 =

R2: R1 - R2  =

R2 ÷ 3.2 =  

R1: R1 - 3R2 =

x = 0.65625, y = 0.71875

if the eqn of the parabola is f(x) = (x-4)(x+2), we need to mult. this out to find the coordinates of the vertex.

then f(x) = x^2 + 2x - 4x - 8, and f(x) = x^2 - 2x - 8.

one way in which you can find the vertex is to calculate x = -b / (2a).   here, that comes to

        )

x = = 1.   f(1) = 1^2 - 2(1) - 8 = - 9.   vertex is at (1, -9).

        2(1) 

find another point on the curve:   let x=0, for which y=-8.   then (0, -8) is on the curve.   plot the vertex and this point and draw a smooth parabola thru both.

hope this

4 + 5 7/9= 9 7/9

step-by-step explanation: