Question

To solve X + Y = 3 ; 3X - 2Y - 4 = 0 , by determinant method find D . ​

Answer 1

Answer:

x+y=3 let the equation 1 × 3

3x-2y-4=0 after switch the 4 to another side then -4 converted into +4

so our 2 equation is 3x-2y=4

•

• • let the equation 1 × with 3

we get 3x+3y=9

then subtract eq 1 from eq 2

3x+3y=9-----1

3x-2y=4------2

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we cut 3x

y=5

then the value of y put in eq 1

3x+3y=9

•

•. • 3x+3(5)=9

3x+15=9

3x=9-15

3x= -6

x= -6/ 3

the value of x=-2