OpenStudy (anonymous):

Write a justification for each step. (picture is in answers) HJ = HI + IJ ___________________ 7x − 3 = (2x + 6) + (3x − 3) ___________________ 7x − 3 = 5x + 3 ___________________ 7x = 5x + 6 ___________________ 2x = 6 ___________________ x = 3 _____________________

4 years ago
OpenStudy (anonymous):
4 years ago

OpenStudy (jim_thompson5910):

were you able to get anywhere?

4 years ago
OpenStudy (anonymous):

At the second step, use 'Order of Operations' and apply the right operations on the right side of the =

4 years ago
OpenStudy (anonymous):

You don't use the Order of Operations. It is already solved for you. You just have to name what they did.

4 years ago
OpenStudy (jim_thompson5910):

why is HJ = HI + IJ true

4 years ago
OpenStudy (anonymous):

what.?

4 years ago
OpenStudy (jim_thompson5910):

what is the first justification?

4 years ago
OpenStudy (anonymous):

uhhh, idk. thats why im asking what they are..

4 years ago
OpenStudy (jim_thompson5910):

we can't give out answers, you have to try and give some effort

4 years ago
OpenStudy (jim_thompson5910):

think of having two segments then combine them to form a bigger segment what rule did I just use?

4 years ago
OpenStudy (anonymous):

addition.??

4 years ago
OpenStudy (jim_thompson5910):

what kind of addition

4 years ago
OpenStudy (jim_thompson5910):

line addition? segment addition?

4 years ago
OpenStudy (anonymous):

uhhhh. I have no clue.

4 years ago
OpenStudy (jim_thompson5910):

we have 2 segments, so it's segment addition ie we're using the segment addition postulate

4 years ago
OpenStudy (jim_thompson5910):

so "segment addition postulate" is the first justification

4 years ago
OpenStudy (anonymous):

well since we can't give the answers i had to point you in some kind of direction.

4 years ago
OpenStudy (jim_thompson5910):

the second justification is having you replace something with its equivalent counterpart what is this called mathematically?

4 years ago
OpenStudy (jim_thompson5910):

for instance, if i know that x = 3 and I have the expression x+5 I go from x+5 to 3+5 I replaced x with 3 (since x = 3). What rule did I just use?

4 years ago
OpenStudy (anonymous):

Im soo confused...

4 years ago
OpenStudy (jim_thompson5910):

Think of another term for when a sports player gets replaced

4 years ago