Prove that your answer is correct. $a|b$ if and only if $ac|bc$.
136854
Prove: For a,b,c positive integers, ac divides bc if and only if a divides b
142993
Proof of A ⊆ C and B ⊆ C ⇔ A ∪ B ⊆ C
13026
Prove that if AB=I_m, then rk(A)=rk(B).
47232
Prove $\forall a,b,c \in \mathbb Z$, if $ab+ac\equiv 3\pmod 6$ then $b \not\equiv c \pmod 6$ by contraposition
151038
How to prove (A v B), (A → C), (B → D) therefore (C v D)
75199
$a \equiv b \pmod n$ and $c\equiv d \pmod n$ implies $ac \equiv bd \pmod n$
124868
Prove that $\frac{bc}{b+c}+\frac{ca}{c+a}+\frac{ab}{a+b}<\frac{a+b+c}{2}$
135779
Prove the following: If $a \mid bc$, then $a \mid \gcd(a, b)c$.
105367
Proving $||\vec{a}+\vec{b}|| = ||\vec{a}-\vec{b}|| \iff \vec{a} \perp \vec{b}$
153670
Prove that if $a \mid b$ and $b \mid c$, then $a \mid c$.
35242
If $a$, $b$, $c$, $\frac{a}{b}+\frac{b}{c}+\frac{c}{a}$, and $\frac{a}{c}+\frac{b}{a}+\frac{c}{b}$ are all integers, then $|a|=|b|=|c|$
97667
If $a<b$, $c<d$ then $a+c<b+d$?
57125
Prove the distributive law $a(b+c)=ab+ac$ for real numbers?
26766
Proving : $A \cap (B-C) = (A \cap B) - (A \cap C)$
1991
If $\gcd(a,b)=1$ and $a$ and $b$ divide $c$, then so does $ab$
136367
Prove $ ∀a, b, c ∈ Z,$ if $ab + ac ≡ 3$ (mod 6) then b $\not\equiv$ c (mod 6).
56399
Proof for $A \cup B = B$ if and only if $A \subset B$