Need Help with this one

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

Janice determined there were 10 possible outcomes when tossing two coins and spinning a spinner numbered 1 through 6. what is the correct number? what might have been janice's error?

Which statement best describes how to determine whether f(x) = x squared- x +8 is an even function ?