i am not sure
if 2x + y = 7, what is the value of y when x = 3?
y = 3x - 2 3x = y + 2 x = y + 2 --------- 3
= 10y= x / 2y= y * 3
In expressions such as "x-y", both "x" and "y" can have any value. The value of "x-y" will depend on what the value of "x" and the value of "y" are.
One possible answer x = 2, y = 3. Another is x = 1, y = 4.5 Or x = 0.5, y = 5.25. Etc, etc, etc...
-3xy is a monomial where x and y are variables and -3 is the coefficient of the monomial.If we know the value of y, we have to substitute it for y, and we say that -3(y-value) is the coefficient of x.
y is 2/3.
x + 2 = y x - y + y - x = 0, even though what is y equivalent. Are you sure, you are looking for something else?
(2)x=Y-4
-2
-3x+y = 7 x-y = -3 Add both equations together to eliminate y: -2x = 4 Divide both sides by -2 to find the value of x: x = -2 Substitute the value of x into the original equations to find the value of y: Therefore: x = -2 and y = 1
2