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16-06-2021
Mathematics

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5x+3y=27
7x+9y=51
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todoroxi77 todoroxi77

16-06-2021

7(5x+3y=27)
-5(7x+9y=51)
———————
35x+21y=189
-35x-45y=-255
————————
-24y=-66
Y=-66/-24

Y=2.75
——————-
Now replace Y with one of the equations to find x
—————
5x+3(2.75)=27
5x+8.25=27

5x=27-8.25
X=18.75/5
X=3.75
——————
Final answer =
X=3.75
Y=2.75

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