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Mathematics 8 Online
OpenStudy (nightmarenight):

5 quick questions? I'm in a rush. Will fan and give medal. Attached below!

OpenStudy (nightmarenight):

1. What is the equation of the yz-trace for the plane 4x - 3y + z = 12? x = 3 4x - 3y = 12 -4y + 12z = 12 -3y + z = 12 2. How many trace lines can be drawn for the plane 2x + 4z = 5? 0 1 2 3 3. What is the equation of the xz-trace for the plane 7x - 2y + 3z = 19? 7x + 3z = 19 7x - 3z = 19 -2y + 3z = 19 2y + 3z = 19 4. What is the equation of the xy-trace for the plane -5x - 2y - 3z = 10? -3z = 10 -5x - 2y = 10 2y - 3z = 10 -2y - 3z = 10 5. The equation of the yz-trace is y + 2z = 4 for which plane? 3x - 3y + 6z = 12 -3x - y + 6z = 12 -6x - 3y + z = 12 3x - 3y + z = 12

OpenStudy (nightmarenight):

@misty1212

OpenStudy (bee_see):

#2 is 1.

OpenStudy (nightmarenight):

as in the answer 1 or as in the first answer

OpenStudy (bee_see):

for question 2.

OpenStudy (nightmarenight):

ok

OpenStudy (nightmarenight):

do you know how the other ones work @Bee_see

OpenStudy (bee_see):

#1 is D

OpenStudy (bee_see):

#3 is A

OpenStudy (nightmarenight):

do you know the last 2

OpenStudy (bee_see):

#4 B

OpenStudy (bee_see):

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OpenStudy (bee_see):

for 5, replace x with 0 in each equation in the choices and see if you get y+2z=4

OpenStudy (bee_see):

are they only 4 choices for #5

OpenStudy (bee_see):

none fit

OpenStudy (nightmarenight):

yes theres only 4 @Bee_see

OpenStudy (bee_see):

ok. let me redo the problem..maybe I'm missing something...

OpenStudy (bee_see):

it could be A, but that 12 would have to be negative.

OpenStudy (bee_see):

can you check #5? maybe you mean -y.

OpenStudy (bee_see):

in the original problem

OpenStudy (bee_see):

then #5 would be A

OpenStudy (nightmarenight):

it is -y im sorry @Bee_see

OpenStudy (bee_see):

ok

OpenStudy (bee_see):

so 3x - 3y + 6z = 12 is the answer.

OpenStudy (nightmarenight):

thank you!! @Bee_see

OpenStudy (bee_see):

you are welcome

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