It would be an odd number. Starting from think of pairs of numbers adding up to 11. 1 and 10....hmm that won't do. 2 and 9, yes. 3 and 8, no. 4 and 7, yes. 5 and 6, no. 6 and 5, yes. 7 and 4, no. 8 and 3 yes. 9 and 2, no. … Read more

Substitute the value of X into the equation. (1/3)y2 + 12 = 15, (1/3)y2 = 15 - 12, (1/3)y2 = 3, (multiply 1/3 by y2) y2/3 = 3/1, (now cross multiply) y2 *1 = 3*3, y2 = 9, y = 9/2, y = 4.5