please recheck the given for the system of equations. the second one isn't an equation and is merely a mathematical expression.

x+y=10

then x=4y

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x+y=10

then x=4y

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x+4y

let x in (x+y=10) be 0

x+y=10

0+y=10

y=10

let y in (x+4y) be 10

x+4y

x+4(10)

x+40

x=-40

So in using substitution method and by substituting it by 0 you will get an answer of y=10 and x=-40

x = 4y -----equation 2

substitute equation 2 to equation 1

x + y = 10

4y + y = 10

5y = 10

substitute y=2 to equation 2

x = 4y

x =4(2)