Question

For the following system, if you isolated x in the second equation to use the Substitution Method, what expression would you substitute into the first equation?

2x + y = 8
-x - 3y = -12

answer choices
3y + 12

-3y + 12

3y - 12

-3y - 12

Answer 1

@superdavesuper

Answer 2

"isolate x in the second equation" means move x on one side of = n everything else on the other...

Answer 3

i know but then it asks about the 1st equation

Answer 4

dats AFTER u isolate x; then u put it in the 1st eqn. so the Q itself is asking abt the 2nd eqn only.

Answer 5

ok so im guessing its C

Answer 6

nope - rearrange 2nd eqn until u get x=....

Answer 7

B is my 2nd guess cuz of the positive 12

Answer 8

bingo :)

Answer 9

yay, thanks ! can you help me with another one ?

Answer 10

only if its not 2 complicated :P

Answer 11

system A
3x + 2y = 3
–2x – 8y = –1

system b
–x - 14y = 1
–2x - 8y = –1

Which of the following statements is correct about the two systems of equations?
The value of x for System B will be one–third of the value of x for System A because the coefficient of x in the first equation of System B is one third times the coefficient of x in the first equation of System A.

The value of x for System A will be equal to the value of y for System B because the first equation of System B is obtained by adding –4 to the first equation of System A and the second equations are identical.

They will have the same solution because they represent the same lines when plotted on the coordinate axes.

They will have the same solution because the first equation of System B is obtained by adding the first equation of System A to 2 times the second equation of System A.

Answer 12

AHHHHH i thought i said not 2 complicated...

Answer 13

you hot girl tee hee

Answer 14

ok, ill get another question, A system of equations is shown below:

5x + 2y = 3 (equation 1)
2x – 3y = 1 (equation 2)

A student wants to prove that if equation 2 is kept unchanged and equation 1 is replaced with the sum of equation 1 and a multiple of equation 2, the solution to the new system of equations is the same as the solution to the original system of equations. If equation 2 is multiplied by 1, which of the following steps should the student use for the proof?

Show that the solution to the system of equations 7x – y = 4 and 2x – 3y = 1 is the same as the solution to the given system of equations

Show that the solution to the system of equations 2x + 5y = 3 and 3x – 2y = 1 is the same as the solution to the given system of equations

Show that the solution to the system of equations 9x + 4y = 5 and 7x – y = 4 is the same as the solution to the given system of equations

Show that the solution to the system of equations –4x + 9y = 5 and 2x – 3y = 1 is the same as the solution to the given system of equations

Answer 15

your hot tee hee

Answer 16

@superdavesuper

Answer 17

Done? :)

Answer 18

not quite, i need help with one more.

Answer 19

hahahaa but some1 else is helping w dat already :)

Answer 20

@superdavesuper

Midge baked 6 cookies and 4 brownies. Midge only has enough ingredients to bake at most 25 cookies or brownies total. Let x represent the number of more cookies and y represent the number of more brownies that Midge can bake. Which of the following graphs best represents the relationship between x and y?

Answer 21

OK a few things from the Q: at most 25 cookies or brownies...but already baked 6 cookies AND 4 brownies. So how much ingredients are left? Take a guess plz? :)

Answer 22

15

Answer 23

Good :) then which graph u think is related to 15?

Answer 24

the first one.

Answer 25

yup yup u are getting GOOD at math @yeah_i_suck_at_math lol

Answer 26

yay, thanks