Answer:


Step-by-step explanation:
Use the trigonometry formula

You are given that

Substitute into the first formula

Angle
is acute angle, then the sine of this angle is positive and

Answer:
x = 4y/3
Step-by-step explanation:
y = 3x/4
Multiply both sides by 4.
4y = 3x
Divide both sides by 3.
x = 4y/3