The sum of the angle measures of any triangle is
180
degrees. Suppose that one angle in a triangle has a degree measure of
7x+3
and another has a degree measure of
3x-6
. Write an expression for the degree measure of the third angle in the triangle.

Question

The sum of the angle measures of any triangle is 
180
 degrees. Suppose that one angle in a triangle has a degree measure of 
7x+3
 and another has a degree measure of 
3x-6
. Write an expression for the degree measure of the third angle in the triangle.

anonymous · Answer

@Legends is this the kind of geometry you like by any chance lol

mathstudent55 · Answer

Add the two given angle measures and subtract the sum form 180.

mrnood · Answer

first write the sum of the 2 angles you know

i.e.  what is 

7x+3 + 3x- 6  ??

anonymous · Answer

that's where I'm stuck ( math is not my strong subject at all so I'm sorry if i make it complicated ) I think it's the "x" that is intimidating =o

mrnood · Answer

it does not ask you to solve the value of the 3rd angle. It anly asks you to find an 'expression'

You cannot solve the value, because x is not know.

so I will write the equation aove in a slightly diferent way:

what is
7x+3x  +   3 -6

anonymous · Answer

oh ok so 10x - 3

mrnood · Answer

Yes good

Now that is the sum of the 2 known angles , and oyu know that all 3 angles add up to 180

so the last angle must be      180 - sum of others

write that down using the numbers you answered above...

anonymous · Answer

180 - 10x -3

anonymous · Answer

180 - ( 10x -3)

mrnood · Answer

OK - that is good - but you need to be careful of the minus sign.

It is beeter if you write it like this:

OK you got it

anonymous · Answer

thank you!! =)

mrnood · Answer

now do that sum, being careful when you put the minus sign 'inside' the bracket