Calculation: QPpFvT - 1

 
 x1
/ x2
  = 
 
 y1
/ y2
 
 x1
/ x2
 =  
 y1
/ y2
$$\frac{x1}{x2}$$ = $$\frac{y1}{y2}$$
x1 =  
 y1* x2
/ y2
$$x1$$ = $$\frac{y1\cdot x2}{y2}$$
x1 =  
 x2* y1
/ y2
$$x1$$ = $$\frac{x2\cdot y1}{y2}$$
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