Depends what the expression is. Just plug in 8 for y in the expression and that'll do it for you.
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∙ 13y ago5x=4012y=84124
y=8 y = 2x y = 2(4) <-- substitute 4 for x y = 8 <-- this is your answer
21
In the expression 5 + y + 8, y is a variable. We know how much 5 and 8 are, those are definite quantities. Only y has an unknown, and hence variable value.
If y = 3 then what is the value of: y + 8 = ? a number equal eight
5x=4012y=84124
5X - 2Y X = 9 Y = 4 5(9) - 2(4) 45 - 8 37 is the value
The value is 1 if (x, y) = (4, 3) and 0 otherwise.
x=y-8 z=x+12
y = (3 X 8) - 5 = 21.
y=8 y = 2x y = 2(4) <-- substitute 4 for x y = 8 <-- this is your answer
If: 2y-10 = 8 Then: y = 9
x=-1.5
8
y = 8
21
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