Question

help please

Answer 1

solve the system by substitution

Answer 2

-4.5x-2y=-12.5
3.25x-y=-0.75

Answer 3

hint: solve for y in the second equation

Answer 4

how do i do that

Answer 5

how would you move the 3.25x over?

Answer 6

subtract it?

Answer 7

subtract 3.25x from both sides, yes

Answer 8

giving you what?

Answer 9

-4

Answer 10

-0.75 and -3.25x are NOT like terms

Answer 11

-4x?

Answer 12

you can't combine them

Answer 13

just leave it as -0.75-3.25x

Answer 14

so -y=-0.75-3.25

Answer 15

-y=-0.75-3.25x

Answer 16

then we multiply both sides by -1. Why? To turn that -y into +y which is just y

so we'd go from
-y=-0.75-3.25x
to
y=0.75+3.25x
every negative flips to a positive

Answer 17

ok

Answer 18

then what?

Answer 19

now we plug that into the first equation


\[\Large -4.5x-2y=-12.5\]
\[\Large -4.5x-2*(y)=-12.5\]
\[\Large -4.5x-2*({\color{red}{y}})=-12.5\]
\[\Large -4.5x-2*({\color{red}{0.75+3.25x}})=-12.5\]
\[\Large -4.5x-2*(0.75+3.25x)=-12.5\]
\[\Large -4.5x-2*(0.75)-2(3.25x)=-12.5\]
\[\Large -4.5x-1.5-6.5x=-12.5\]
I'll let you solve for x

Answer 20

-2x=-11

Answer 21

how did you get -2x?

Answer 22

i added -4.5 to -6.5

Answer 23

or would i just combine

Answer 24

-4.5 plus -6.5 does not equal -2

Answer 25

-11

Answer 26

so we have -11x = -11 which means x = ???

Answer 27

1

Answer 28

now plug that into y=0.75+3.25x

Answer 29

ok....

Answer 30

what would that look like??

Answer 31

replace x (in `y=0.75+3.25x`) with 1

Answer 32

no which equation

Answer 33

y=0.75+3.25x

Answer 34

oh so y=0.75+3.25(1)

Answer 35

yes

Answer 36

it will still be y=0.75+3.25

Answer 37

0.75+3.25 = ???

Answer 38

4

Answer 39

so x = 1 and y = 4

Answer 40

oh is that all?

Answer 41

yep

Answer 42

okay i still have a few more mind helping me out

Answer 43

ill make new question

Answer 44

go ahead