Question

solve cross multiplication 3x+4y=25, 5x-6y=-9 please been fastt​

Answer 1

Answer:

3x+4y=25 ...(1)

5x−6y=−9 ...(2)

Multiply (1) by 3 and (2) by 2

9x+12y=75

(+) 10x−12y =−18

19x=57

x=3

Put x = 3 in (2)

5x−6y=−9

5(3)−64=−9

6y=15+9

64=24

y=4

Answer 2

Step-by-step explanation:

(3x+4y=25)×5 = 15x+20y=125 ---------------( 1 )

(5x-6y=-9)×3 = 15x-18y=-27 ---------------( 2 )

by solving equations ( 1 ) & ( 2 )

we get,

38y=152

y=4

put y value in equation ( 2 )

15x-18(4)=-27

15x-72=-27

15x=45

x=3