How can you tell that a point on a graph is neither a minimum or maximum?

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827

What’s the answer ? use the picture to see the problem

20 points for the answer. this is for real , don't put random ! a rectangle has a length of 4 centimeters and a width of 7 centimeters. what is the effect on the perimeter when the dimensions are multiplied by 5? the perimeter is increased by a factor of 5. the perimeter is increased by a factor of 20. the perimeter is increased by a factor of 25. the perimeter is increased by a factor of 100.