Question

@iGreen
solve using substitution please
2x+5y=2
-3x-y=-3

Answer 1

from second equation find y in terms of x
then replace the y in the first equation with this expression in x
sole for x

Answer 2

nevermind sorry I meant this equation

Answer 3

* solve

Answer 4

2x-3y=4
x=-4y-9

Answer 5

ok
the easiest way is to replace the x in first equation by -4y-9:-
2(-4y-9) - 3y = 4

now solve this for y

Answer 6

can you do that?

Answer 7

-8y-18 what do I do with the -3y=4?

Answer 8

-8y - 18 - 3y = 4
add like terms
-11y - 18 = 4
add 18 to both sides
-11y = 22
divide both sides by -11
y = -2

Answer 9

now to find the value of x you substitute y = -2 into the first equation and solve for x

Answer 10

I got -1? is that right?

Answer 11

2x - 3(-2) = 4
2x = + 6 = 4
2x = -2
x = -1

yes

Answer 12

* 2x + 6 = 4

Answer 13

good work

Answer 14

thanks please stay I need more help.

Answer 15

ok

Answer 16

but i have to go in 10 minutes

Answer 17

sorry computer froze
x+y=15
4x+3y=38

Answer 18

do you want to solve this by substitution also?

Answer 19

yes

Answer 20

x + y = 15
subtract x from both sides
y = 15 - x

now plug this into the second equation:-
4x + 3(15 - x) = 38
4x + 45 - 3x = 38 (4x - 3x = x so:-
x + 45 = 38
now subtract 45 form both sides to get value of x

Answer 21

then plug this value of x into the equation x = y = 15 to get value of y

Answer 22

* x + y = 15

Answer 23

x=7?

Answer 24

38 - 45 = -7

Answer 25

x + 45 = 38
x + 45 - 45 = 38 - 45
x = -7

Answer 26

okay got that so plug -7 into x+y=15?

Answer 27

yes

Answer 28

-7 + y = 15

Answer 29

gotta go in a few minutes

Answer 30

okay thanks so much is the answer 22 though?

Answer 31

yes

Answer 32

yw