Question

9x+4y=3 3x-3y=3 by substitution method​

Answer 1

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3x – y = 3 ; 9x – 3y = 9 solve by substitution method.

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3x – y = 3 ... (i)

9x – 3y = 9 ... (ii)

From equation (i), we get

y = 3x – 3 ... (iii)

Putting this value in equation (ii), we get

9x – 3(3x – 3) = 9

9x – 9x + 9 = 9

9 = 9

This is always true.

Hence, the given pair of equations has infinite possible solutions and the relation between these variables can be given by y = 3x – 3

Therefore, one of its possible solutions is x = 1, y = 0.

Answer 2

9X+4y=3____{1} equation

3X-3y=3_____{2}equation

now,

3-9X

y=______

4

on putting the value of. Y in equation 2

we get,

3X-3y=3

3X-3[3-9X\4]=3

3X-9+27X=3×4

30X=12+9

30X=21

X=21/30

X=7/10

Now we put X value In equation 1,

we get,

y= 3-9X

____

4

y=3-9(7/10)

______

4

y= -6×7

____

4×10

y= -42

____

4×10

y=1.05