solve: 5x+10y=35 and 2x-4y=28
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Step-by-step explanation:
5x+10y=35--------(1)
2x-4y=28-----------(2)
(1)×2=10x+20y=70
(2)×5=10x-20y=140
(-) (+) (-)
------------------------------
40y= -70
=> y = -70/40 = -7/4
putting the value of y in equation (1) we can get
5x+10y=35
=>5x+10×(-7/4)=35
=>5x-35/2=35
=>5x=35+35/2
=>5x=(70+35)/2
=>5x=105/2
=>x=105/2×1/5
=>x=21/2
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