Question

can someone help me im having a hard time understanding this

Answer 1

Okay, that little red box means that it’s a 90 angle soo that’s basically saying
3x= 90 so we gotta solve for x

3x=90
X=90/3
X= 30
Now that we know x we can solve for y in 2x + 3y (this equals 90 because they are complimentary angles Bc they add up to 180 and 90 is on the other side)
2(30) + 3y= 90
60+ 3y =90
3y= 90-60
3y = 30
Y=30/3
Y= 10

Answer 2

So in this problem. the red square means that that angle equals 90 degrees. so you set of an equation like this... 3x=90 then you solve for x
because a straight line is 180 degrees. the other angle must be 90 as well.
2x+3y=90 plug in the value of x that you found before to solve for y

hope this helps