What is the value of x in the rhombus below?

Question

yourboydusty · Answer

yourboydusty · Answer

I actually dont know how to do this one

yourboydusty · Answer

Question 31 of 56
i am so close to being done

yourboydusty · Answer

i get 1/2 points off for it being late though :(

welshfella · Answer

Hint  the diagonals of a rhombus are at right angles to each other so the triangle with the marked angles is a right angled triangle.

yourboydusty · Answer

So what should i do?

welshfella · Answer

well the 2 angles marked add up to 90 degrees

welshfella · Answer

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welshfella · Answer

so form an equation
3x + 5 + 3x - 11 = 90

and solve for x.

yourboydusty · Answer

I got 14
11-5=6
3x+3x=6x
90-6=84
84/6=14

yourboydusty · Answer

X=14?

welshfella · Answer

theres a mistake on the 4 th line.

yourboydusty · Answer

what?

welshfella · Answer

its not 90 - 6

yourboydusty · Answer

+6

yourboydusty · Answer

if so then it would be X=16x

welshfella · Answer

right  
beacaus -11 + 5 = -6   and you have to  add 6 to both sides

welshfella · Answer

6x - 11 + 5 = 90
6x - 6 = 90
6x -6 + 6 = 90 + 6
6x = 96
x = 16

Yes

welshfella · Answer

Its best to write the solution as above 
that way you are less likely to make errors

welshfella · Answer

do you follow what I mean
- write the whole equation on each line - not part of it.

yourboydusty · Answer

thank you :D

welshfella · Answer

yw
the method is as important as getting the correct answer.