Which point lies in the plane represented by the equation 2x + 7y + 3z = -25?

Algebra
Tutor: None Selected Time limit: 1 Day

 Which point lies in the plane represented by the equation 2x + 7y + 3z = -25?
 
A(–3, 3, –2)
B(–6, –4, 5)
C(6, 1, –3)
D(6, 1, 2)
 What are the intercepts of the equation 2x+3/2y+3z=6
 
A(3, 0, 0), (0, 4, 0), (0, 0, 6)
B(3, 0, 0), (0, 4, 0), (0, 0, 2)
C(1, 0, 0), (0, 4, 0), (0, 0, 3)
D (4, 0, 0), (0, 3, 0), (0, 0, 6)
May 14th, 2015

First question: The answer is B since (2 * -6) + (7 * -4) + (3 * 5) = -25

Second question: This answer is B since (2 * 3) + 0 + 0 = 6, (3/2)*4 + 0 + 0 = 3 * 2 = 6 and (3 * 2) + 0 + 0 = 6

May 14th, 2015

Graph the information presented in the table. Use that graph to predict the week that revenue will equal expenses for this small company.
Note: Revenue and Expenses are drawn on the vertical axis and Month is on the horizontal axis.https://tcan4424-oakcliff-ccl.gradpoint.com/Resource/3025063,8E8,0,0,0,0,0/Assets/testitemimages/algebra_2a/linear_systems/mc008-1.jpg



 

AWeek 7
BWeek 8
CWeek 6
DWeek 5
pleasee :c

May 14th, 2015

I will be unable to do this now as I don't have graph paper but I can tell you how to do it. You need to get some graph paper and draw a pair of axes. On the x axis, the bottom one, write a time scale in months but make sure each gap is big enough to split into four pieces each so you can plot the data for each week. Then on the y axis, the vertical one, write a money scale up to around $3100. Then plot each of the points for the data they give you by drawing a little cross. Then get a ruler and draw two lines of best fit, one through the points for revenue and one through the points for expenses. Now look at where these two lines you have drawn cross and go straight down the x axis to see what value these cross at. This is the week that revenue will equal expenses for the small company. Hope that helped!!

May 14th, 2015

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