Question

Solve using the substitution method
3x-3y=-18
7x+72=y

Answer 1

hey Rachel, yesterday I posted a detailed answer to one of your similar questions, I suggest you make an effort to learn to do these on your own....

You can do the steps and i will confirm if u hv done ok or not.....
that will u will be able to solve them in a test also on your own..

Answer 2

I apologize I am trying to get an assignment done. I live in a city in arizona that is under is in a state of emergency for a wild fire. I have been evacuated and this assignment is already past due. I am just trying to get the last few problems done that I am having problems with.

Answer 3

its a system

Answer 4

ok will help then..

Answer 5

take y and subtract

Answer 6

take the 72 to the other side by subtracting

Answer 7

take the second equation and multiply by -3

Answer 8

now add down

Answer 9

3x+-21x =-18x

Answer 10

the y's cancel

Answer 11

-18+-72=-90

Answer 12

reduce lst equation to x-y=-6
then we will get x=-6+y
then we substitute it to second equation an we will get -42+7y+72=y,y=-5,x=-11

Answer 13

-90/-18=10/3

Answer 14

so x =10/3

Answer 15

now you substitute 10 thirds into the equation to get your y coordinate

Answer 16

given equations are

3x - 3y = -18 ------- (1)
7x - y = -72 ---------- (2) (this u get after rearranging)

multiply (2) by 3, to get
21x - 3y = -216
now and subtract it from (1) to get
- 18x = 198
x = 198/-18 = -11

now put x = -11 in (1)
3(-11) - 3y = -18
-33 - 3y = -18
-3y = -18 + 33
y = 15/-3 = -5

Answer 17

@chris

u hv made some errors, your values are wrong..... pls recheck

Answer 18

I multiplied by -3 to cancel the y's

Answer 19

the second shouldve been -21x +3y=

Answer 20

216 my bad forgot to multiply the last number

Answer 21

@chris
pls check in yr ans u hv put -90/-18 as 10/3, this is incorrect
-90/-18 = 5

Answer 22

good lookin

Answer 23

got a medal for me Rachel !!!!!

Answer 24

harkerat help me with one

Answer 25

still there?

Answer 26

of course you are so thorough...didn't know it was you though since your name is different

Answer 27

sorry chris, am busy with other things tooo...
go on what can i help u with....