Question

check my answer? medal! c:

Answer 1

Solve each system by substitution
11. { 14x – 35 = 7y
-25 – 6x = 5y
14x – 35 = 7y
7(2x – 5) = 7y
y= 2x – 5
-25 – 6x = 5y
-6x – 5y – 25 = 0
y=(-6x – 25)
(-4,-7.5)

Solve each system by elimination.
13. { 2x + 3y = 4
4x + 6y = 9
2x = -3y + 4
x = (-3y+4)/2
4[(-3y+4)/2] - 9y = 9
2(-3y+4) - 9y = 9
-6y + 10 - 9y = 9
-15y = -1
y = 1/15
x = (-3y+4)/2
x = (-3(1/15)+4)/2
x = [(-1/5)+4/2
= (24/4)/2 = 12/5
Final Answer: y = -1/3 when x = 12/5

Answer 2

oops can you see the whole equation for #11?

Answer 3

I'm getting different answers for #11 and #13

Answer 4

when you get to -6x – 5y – 25 = 0, plug in y = 2x – 5 and solve for x

-6x – 5y – 25 = 0

-6x – 5(2x-5) – 25 = 0

x = ???

Answer 5

oh dang :/ I thought I finally knew how to solve these problems.. do you mind helping me? showing how you got your answers im so tired ive been working on these problems since 2 pm ugh

Answer 6

for #11, you got -6x – 5y – 25 = 0 correct

Answer 7

now you plug in y = 2x - 5 and solve for x

Answer 8

so you have to solve -6x – 5(2x-5) – 25 = 0

Answer 9

for #11 I got

{ 14x–35=7y
-25–6x=5y
14x–35=7y
7(2x–5)=7y
y=2x–5
-25–6x=5y
-6x–5y–25=0
y=(-6x–25)
(-4,-7.5)

Answer 10

all I am seeing are boxes?

Answer 11

refresh the page

Answer 12

the boxes will go away

Answer 13

okay got it :)

Answer 14

they went away s:

Answer 15

are you able to solve -6x - 5(2x-5) - 25 = 0

Answer 16

x=0?

Answer 17

then you will use that value of x to find y

Answer 18

x = 0

y = 2x - 5

y = ???

Answer 19

y=2x-5=0

Answer 20

if x = 0, then y is ...


y = 2x - 5

y = 2(0) - 5 ... replace every x with 0

y = ???

Answer 21

y=-5?

Answer 22

yes

Answer 23

so the answer to #11 is (0, -5)

Answer 24

since you found that x = 0 and y = -5

Answer 25

thank you soooo much!! :) do you mind helping me with #13 also?

Answer 26

notice your second equation in #13 is 4x + 6y = 9

Answer 27

yet you somehow have

4[(-3y+4)/2] - 9y = 9

after you plugged in that x value. Where did the -9y come from?

Answer 28

it should be

4[(-3y+4)/2] + 6y = 9

Answer 29

I honestly don't know my friend was trying to help me :c

Answer 30

I see

Answer 31

sorry I suck at math /: any other subject im good at lol

Answer 32

thats ok

Answer 33

are you able to compute 4[(-3y+4)/2]

Answer 34

or simplify that

Answer 35

yes hold on 2(4-3y)?

Answer 36

keep going

Answer 37

simplify that answer also?

Answer 38

distribute

Answer 39

8-6y?

Answer 40

4[(-3y+4)/2] + 6y = 9

turns into

8-6y + 6y = 9

Answer 41

thank you c: do I keep going? or is that the answer?

Answer 42

keep going and try to solve for y

Answer 43

y= 0?

Answer 44

what is -6y + 6y

Answer 45

I keep getting 0 on my calculator... 36y?

Answer 46

maybe think of it as 6y - 6y

Answer 47

but yeah you get 0y or just 0

Answer 48

8-6y + 6y = 9

turns into

8+0 = 9

and that becomes

8 = 9

Answer 49

but I'm sure you see the problem

Answer 50

thank you again I really appreciate you helping me! c:

Answer 51

so what's the answer to #13?

Answer 52

(9,0)?

Answer 53

is 8 = 9 true?

Answer 54

no

Answer 55

since it's always false, regardless of what x and y are, this means that the overall system has no solutions at all. There's no way to make that equation true.

Answer 56

visually, you'll have 2 parallel lines that never intersect

you need a point of intersection to have a solution

Answer 57

ohh duh >_< sorry wasn't thinking correctly