SIMPLIFY: 3X+5Y-XY WHEN X=7 AND Y=3

Question

a. 88
b. 36
c. 15
d. -36

Answer 1

To simplify the expression 3X + 5Y - XY when X = 7 and Y = 3, substitute the values in the expression and solve:

= 3(7) + 5(3) - 7(3)
= 21 + 15 - 21
= 36 - 21
= 15

So, the simplified expression is 15 when X = 7 and Y = 3.

Therefore, the correct answer is:

c. 15