Depends what the expression is. Just plug in 8 for y in the expression and that'll do it for you.
5x=4012y=84124
To evaluate the expression (3xy + 4y^3) when (y = 2) and (x = 5), substitute the values into the expression. This gives: [ 3(5)(2) + 4(2^3) = 30 + 4(8) = 30 + 32 = 62. ] Thus, the value of the expression is 62.
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.
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
To find the value of y in the expression 15y-4 = 41, you need to isolate y. Start by adding 4 to both sides of the equation to get 15y = 45. Then, divide both sides by 15 to solve for y, which equals 3. Therefore, the value of y in the expression 15y-4 when it equals 41 is 3.
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