Question

Help with triangles?

Answer 1

All triangles add up to 180. They give you the measure of one angle (right angle, aka 90 degrees), and give equations for the other two. To find the value of x, set up this equation:
90 + (8x - 1) + (4x + 7) = 180
Solve for x

Answer 2

\(\large\color{red}{90}\color{blue}{+8x}\color{red}{-1}\color{blue}{+4x}\color{red}{+7}=\color{red}{180}\)
Can you do the rest from there?

Answer 3

Yeah, x = 7, you plug 7 into the original formulas. Thank you!

Answer 4

correct. good job.