Question

x-3y=7;3x-3y=15 what is x value​

Answer 1

$3x - 3y = 15 - - - - - - (1)$

DIVIDING EQUATION (1) WITH 3 WE GET,

$\frac{3x - 3y = 15}{3}$

$x - y = 5$

$x = 5 + y - - - - - - (2)$

Substitute (2) in x-3y=7

$x - 3y = 7$

$5 + y - 3y = 7$

$5 - 2y = 7$

$- 2y = 7 - 5$

$- 2y = 2$

$y = \frac{ - 2}{2}$

$y = - 1$

Substitute value of y in (2),

$x = 5 + y$

$x = 5 - 1$

$x = 4$

Hence,

The value of y is (-1).

The value of x is 4.

Hope it helps you out......

Answer 2

Explanation:

DIVIDING EQUATION (1) WITH 3 WE GET,

\frac{3x - 3y = 15}{3}

3

3x−3y=15

x - y = 5x−y=5

x = 5 + y - - - - - - (2)x=5+y−−−−−−(2)

Substitute (2) in x-3y=7

x - 3y = 7x−3y=7

5 + y - 3y = 75+y−3y=7

5 - 2y = 75−2y=7

- 2y = 7 - 5−2y=7−5

- 2y = 2−2y=2

y = \frac{ - 2}{2}y=

2

−2

y = - 1y=−1

Substitute value of y in (2),

x = 5 + yx=5+y

x = 5 - 1x=5−1

x = 4x=4

Hence,

The value of y is (-1).

The value of x is 4.

HOPE IT HELPS....

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