Help me with this question please

Two times a number plus three times another number equals 4. three times the first number plus four times the other number is 7. find the numbers

Sample response: if the graph passes the horizontaline test, then the function is one to one. functions that are one to one have inverses that a therefore, the inverse is a hinction compare your response to the sample response above. what did you include in your explanation? a reference to the horizontal-line test d a statement that the function is one-to-one the conclusion that the inverse is a function done

Having a hard time understanding this question (see attachment).