catnixmp catnixmp

22-05-2020
Mathematics

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If x+y=375 and 1.25x+0.75y= 393.75 then what is y

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sbsbjulib sbsbjulib

22-05-2020

Y= 150

Start by using substitution.
Change x+y=375 to x=375-y

Substitute this into 1.25x+0.75y=393.75
1.25(375-y)+0.75y=393.75

Distribute the 1.25
468.75-1.25y+0.75=393.75

Add like terms (y)
468.75-0.5y=393.75

Subtract 468.75 to the right
-0.5y=-75

Divide by -0.5
y=150

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