Question

only 13 and 14 with steps​

Answer 1

Step-by-step explanation:

13.) given,

3x - 4y = 10

XY = -1

now,

(3x -4y )^2 = 9x^2 + 16y^2 - 24 XY

(10)^2 = 9x^2 +16y^2 -24(-1)

100 = 9x^2 + 16y^2 +24

100 - 24 = 9x^2 + 16y^2

76 = 9x^2 + 16y^2.

next question will be solved like this only.

once u try if not solved I will help u then.

hope this helps u ❤