X-10 + 2x + 1= 90° you combine like terms: x+2x= 3x and -10 + 1 = -9 So, 3x - 9 = 90 +9 +9 3x=99 Divide by 3, x= 33 First Angle: x-10 (plug in 33 for x) 33-10 = 23° Second Angle: 2x + 1 (plug in 33 for x) 2(33)+1 66+1= 67° To Check if it’s correct and make a 90° angle: Add 67° plus 23° which equals 90° First angle: 23° Second angle: 67° Hope that help!!
