8x+5y=9, 3x+2y=4 solve by substituting method
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8x+5y=9
=> x = (9-5y)/8 .....(1)
3x+2y=4 .....(2)
From equation (1)and (2) , substituting the value of x we have ...
3×(9-5y)/8 +2y=4
=> 27-15y +16y = 32
=> y = 5 ...(3)
From equation (1)and (3) , substituting the value of y we have ...
x = (9-5y)/8
=> x = (9-5×5 )/8
=> x = (9-25)/8
=> x = -16/8
=> x = -2
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