Given the two sets, which statement is true?
а = {1, 2}
в = {1, 2, 3, 4}
b c a
3 c a
4 c a
a c b
none of the above

A⊆B

Step-by-step explanation:

C⊆D if the set C contains only elements from set D.

Let's look at the first choice:

B⊆A is not true because 3 and 4 are not in A.

Second choice:

3⊆A is not true because 3 is not a set; it is an element.

Also, 3 is not even in {1,2}.

Third choice:

See explanation for choice 2.

Fourth choice:

A⊆B is true because all the elements in A are contained in B.

That is the elements 1 and 2 are contained in the set {1,2,3,4} which is B.

this linear equation would have just one solution.

step-by-step explanation:

the reason why this would have one solution is that it is an expression with just one variable. since that variable is not raised to a power, it will always have just one solution.