Answer:
Step-by-step explanation:
To solve for x, set up the following proportion. Note that these drawings don't represent real triangles.
x/5 = 28/4 Cross Multiply
4x = 28*5 Combine
4x = 150 Divide by 4
x = 150/4
x = 37.5
y/21 = 4/28
28y = 4*21
y = 4*21/28
y = 3
