y=2x -7 and 2x +3y by using substitution method
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7 = 2x- y -----(1) and 2x + 3y = 0 -------(2)
from 1 & 2 equation
2x-y = 7
2x+3y =0. ( sin change)
- - -
____________
0 - 4y = 7
_____________
y = 7/4
put the value equation (2)
2x + 3× 7/4 = 0
2x + 21/4 = 0
2x = - 21/4
x = -21/8
from 1 & 2 equation
2x-y = 7
2x+3y =0. ( sin change)
- - -
____________
0 - 4y = 7
_____________
y = 7/4
put the value equation (2)
2x + 3× 7/4 = 0
2x + 21/4 = 0
2x = - 21/4
x = -21/8
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