SOLUTION: Please help me with these three equations. x = y + 2 1/2x + y = o y = 4/7x + 3 I am suppose to tell whether y varies directly as x. Please help I don't understand.

Algebra ->  Equations -> SOLUTION: Please help me with these three equations. x = y + 2 1/2x + y = o y = 4/7x + 3 I am suppose to tell whether y varies directly as x. Please help I don't understand.       Log On


   



Question 510342: Please help me with these three equations.
x = y + 2
1/2x + y = o
y = 4/7x + 3
I am suppose to tell whether y varies directly as x.
Please help I don't understand.

Answer by oberobic(2304) About Me  (Show Source):
You can put this solution on YOUR website!
EQ1.
x = y +2
y = x -2
.
as x increases, y increases
.
EQ2.
1/2x + y = 0
y = -1/2x
.
as x increases, y decreases
.
EQ3.
y = 4/7x + 3
.
as x increases, y increases
.
Consider the graphs: EQ1 is red, EQ2 is green & EQ3 is blue.
.
graph%28500%2C500%2C-15%2C15%2C-15%2C15%2Cx-2%2C-1%2F2%2Ax%2C4%2F7%2Ax%2B3%29