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couldnt get all of it but tried my best

a screenshot is best because we can see the full problem (even the missing symbols)

sorry here it is

does that make sense?

not really but u can explain it in detail. mabye ill get it

let's say you had
a/b = c/d

if you cross multiplied, you'd get a*d = b*c
agreed?

yea

so what proportion could be set up to lead to AB*BC = EC*DE ?

they seem to look like this but in fraction AB/BC;. something like that.

AB/DE, and EC/DE

more like AB/EC = DE/BC. There are other possibilities
|dw:1436929680423:dw|

|dw:1436929728958:dw|

oops sorry. thats not on my answer choices tho

the closest choice has a fraction DE/EC. would that work?

well as long as they cross multiply to AB*BC = EC*DE, then it will work

there are more possibilities than what I drew up there (maybe 4 possibilities?)

ok hold on

AB/EC=BC/DE
AB/BC=DE/EC
AB=DE BC=EC
AB/BC= -EC/DE

choice C looks funky...there are no fractions there?

try posting a screenshot if you can

there are no fractions in c, and sorry i cant post a screenshot.

ok let me think

in line 3, where it says `3. ABBC = ECDE property of proportion` there are no fractions here either?

actually yea those are fractions

its really hard to paste those kinds of things on here.

so line 3 actually says this right?
AB/BC = EC/DE

yes yes

|dw:1436930874242:dw|

giving
|dw:1436930949685:dw|

omg thanks so much!

can you help me with one more? its a mastery, and i didnt really understand this lesson

sure

AB and BC form a right angle at point B. If A = (-3, -1) and B = (4, 4), what is the equation of BC

first find the equation of the line through A and B

slope?

5/7 is the slope

use that slope to find the equation of the line through those two points

you can use y = mx+b

i think its y=5/7x+8/7

yep

|dw:1436931657035:dw|

AB and BC form a right angle, so
|dw:1436931712083:dw|

what is the slope of BC ?

x + 3y = 16
2x + y = 12
-7x − 5y = -48
7x − 5y = 48

these are the answer choices btw. and the slope for BC is -7/5 right?

what is the equation of the line going through B and has slope of -7/5

use y = mx+b