Question

plz help me guess for this 3 questionp

Answer 1

by angle sum property...
5(y-1)+3(2y-5)+9y=180°
5y-5+6y-15+9y=180
5y+6y+9y-5-15=180
20y-20=180
20y=180+20
20y=200
y=200/20
y=10
so,
substitute y in the degrees
5y-5= 50-5= 45°
6y-15= 60-15= 45°
9y=90°
therefore , it is a right angle triangle ....
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