# Math Help - This doesn't make sense..

1. ## This doesn't make sense..

The measures of two complementary angles are represented by (3x+15) and (2x-10). What is the value of x.

I got 19, but when i sub it in for x, it doesnt add up to 90. What am i doing wrong?

2. Hello, eh501!

The measures of two complementary angles are represented by (3x+15) and (2x-10).
What is the value of x?

I got 19, but when i sub it in for x, it doesnt add up to 90.
What am i doing wrong?
You're checking your answers . . . Good for you!

You made a small slip in arithmetic . . .

$(3x+15) + (2x- 10)\:=\:90\quad\Rightarrow\quad 5x + 5 \:=\:90\quad\Rightarrow\quad 5x \:=\:85\quad\Rightarrow\quad x \:=\:17$

3. Ahhh man, now i know what i did wrong. I didn't -5 instead i +5.