2x + y = 20
|y| <= 20
For how many ordered pairs (x , y) that are solutions of the system above are x and y both integers?
Options:
A) 15
B) 17
C) 19
D) 21
E) 25
Hi - The questions says |y| &lt;=20 so the values of y will range from 0 to 20. So the values of y will be 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20. So 21 (d) is the answer. remember sign doesn't matter for y as y will always be positive.21
<result>D</result>
2x + y = 20
|y| <= 20
For how many ordered pairs (x , y) that are solutions of the system above are x and y both integers?