Question

1.If (x + y, 2x - 7) = (7, 1), find the value of x and y.

Answer 1

Answer:

ANSWER

y=−5x

2

+2x−7

Differentiating the above equation with respect to x, gives us

dx

dy

=−10x+2

For maximum,

dx

dy

=0

Or

2−10x=0

Or

x=

5

1

Hence the above expression reaches its maximum value at x=

5

1

.