Given: mzade = 60° and m2cdf = (3x + 15)
prove: x= 15
what is the missing statement and the missing reason in
step 5?
statements
reasons
1. mzade -60°
1. given
m2cdf -(3x+15)
2. zade and zcdf are vert. zs 2. def. of vert. zs
3. zadezcdf
3. vert. zs
4. mzade - m2cdf
4. def. of
5. ?
5. ?
6.45-3x
6. subtr. prop.
7. 15-x
7. div. prop.
(3x + 15)
-
60°
by
statement: 60 = 3x + 15, reason: substitution
statement: x = 15; reason: subtraction property of
equality