Answer:
Explanation:
1.
x + 5 / 2 = 10
x + 5 = 20 division property
x = 20 - 5 subtraction property
hence, proved
x = 15 reflexive property
2.
5n = 18m + 3p
where, p = 4m + 5
5n = 18m + 3(4m + 5) substitution property
5n = 18m + 12m + 15 multiplication property
5n = 30m + 15 transitive property
5n = 5(6m + 3) division property
hence, proved
n = 6m + 3 substitution property