Question

Solve by substitution method x - 3y = 7 and 3x - 3y = 15 Please answer this question fast!!!!​

Answer 1

Answer:

GIVEN EQUATIONS :–

X - 3 Y = 7 .......(1)

3 X - 3 Y = 15 .......(2)

• GET THE VALUE OF 3 Y FROM EQUATION (1) AND PUT IN EQUATION (2)....

=》 3 X - ( X - 7 ) = 15

=》 2 X = 8

=》 X = 4

• NOW PUT THE VALUE OF 'X' IN EQUATION (1)...

=》 Y = 1

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Answer 2

The value of x is 4 and y is -3 by the substitution method

Step-by-step explanation:

Given:

equations are x-3y = 7 & 3x-3y= 15

To find:

solve by substitution method

Solution:

Let,  x-3y = 7 .........(i) &

3x-3y= 15.............(ii)

Now, subtracting equation (i) from (ii)

3x -  3y=    15

 x -  3y =    7

(-)  (+)       (-)  

2x         =  8  .................(like terms 3y being eliminated)

∴ 2x = 8

∴ x = 8/2

∴ x = 4

Substituting the value of x in equation (ii)

3x - 3y = 15

∴ 3 (4) - 3y = 15

∴ 12 - 3y = 15

∴ -3y = 15 -12

∴ -3y = 3

∴ y = -3

Thus, the solution for the given equations is x = 4 & y = -3

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