if x=7 and y=3 work out 3x-2y

Answer 1

The expression 3x - 2y means to take 3 multiplied by x and subtract 2 multiplied by y. Since x is 7 and y is 3, it then means we take 3 multiplied by 7 and subtract 2 multiplied by 3. There is a certain order in doing the arithmetic though. You must ALWAYS do multiplication (or division) before addition (or subtraction).

So we first multiply 3 and 7 to get 21. Then we multiply 2 and 3 to get 6. Then we subtract and 21 - 6 = 15. So the answer is 15.

Answer 2

You can answer this question by plugging in each variable with the integer supplied.

3(7)-2(3)= 21-6=15