Question

3x+2y=4,8x+5y=9 solve by cross multiplication method

Answer 1

Answer:

x  = -2   and y = 5

Step-by-step explanation:

8x +5y =9       …(1)

Subtract 9 both side we get

8x +5y – 9 = 0

3x +2y =4      …(2)

Subtract 4 both side we get

3x + 2y – 4 = 0

Compare with

we get  

a1 = 8 ,           b1 = 5  ,         and     c1 = -9  

a2  = 3 ,          b2  = 2            and     c2 = -4

Use the formula of cross multiplication

 

We get x  = -2   and y = 5