How do you solve this using additional method elimination
3x + y = 17
4x - y = 18

// Solve equation [1] for the variable  y 
 

// Plug this in for variable  y  in equation [2]

// Solve equation [2] for the variable  x 

// By now we know this much :

// Use the  x  value to solve for  y 

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step-by-step explanation:

t= half of the arc subtended by t.

r= half of the arc subtended by r.  

t+r= half of the arc subtended by t + half of the arc subtended by r= half of 360=180

step-by-step explanation: