Question

4х + бу = 15
3х - 4 y = 7 cross multiplication method ​

Answer 1

Step-by-step explanation:

Given equations are 4x+6y=15 and 3x−4y=7

Comparing with a

1

x+b

1

y+c

1

=0 and a

2

x+b

2

y+c

2

=0 we have

a

1

=4,b

1

=6,c

1

=−15 and a

2

=3,b

2

=−4,c

2

=−7

Now , x=

a

1

b

2

−a

2

b

1

b

1

c

2

−b

2

c

1

and y=

a

1

b

2

−a

2

b

1

c

1

a

2

−c

2

a

1

⇒x=

4×(−4)−3×6

6×(−7)−(−4)×(−15)

and y=

4×(−4)−3×6

−15×3−(−7)×4

⇒x=

−16−18

−42−60

and y=

−16−18

−45+28

⇒x=

−34

−102

and y=

−34

−17

⇒x=3 and y=

2

1

Answer 2

Answer:

it may be x= 3 and y = 4 but u can check at once not confirmed