Question

4x + 2y=4 and 3x -y= -7

Answer 1

y = 4

x = -1

Explanation:

4x + 2y = 4 Eq. 1

3x - y = -7 Eq. 2

from the Eq. 2

3x = y - 7

3x + 7 = y Eq. 3

Replacing the value of the Eq. 3 in the Eq. 1

4x + 2(3x+7) = 4

4x + (2*3x + 2*7) = 4

4x + (6x + 14) = 4

10x + 14 = 4

10x = 4 - 14

10x = - 10

x = -10/10

x = -1

from the Eq. 3

3x + 7 = y

3*-1 + 7 = y

-3 + 7 = y

4 = y

Check:

from the Eq. 1

4x + 2y = 4

4*-1 + 2*4 = 4

-4 + 8 = 4