Given: mtrv = 60° mtrs = (4x)° prove: x = 30 what is the missing reason in step 3? substitution property of equality angle addition postulate subtraction property of equality addition property of equality

Angle addition postulate.

Explanation: If and

here, if we have to prove x=30

If there is a condition that TR is a line which meets with the line segment VS at point R then by the Angle addition postulate,  we can say that ⇒

But,

In option (1) substitution property of equality

If there is condition that  

then we can use  substitution property of equality,

And, in this case ⇒

which is wrong. So, we can not use this property here.

In option (3) subtraction property of equality

There is no use of this property to find the value x.

In option (4) addition property of equality

There is no use of this property to find the value x.

step-by-step explanation:

step-by-step explanation: