On a graph , which type of line shows a direct proportion?
a- downwardly curved line
b- jagged line
c- straight line
d- upwardly curved line

Straight line.

Explanation:

On a graph a straight line shows a direct proportion relation.

The graph equation for a straight line is

y = mx + c

Where

m = slope

c= y-intercept

So here if we change "x" y will change linearly with the change.

B) a jagged line: it is a random relation between two properties

C) downward curved line: It is inverse relation with some log factor or square or other root.

D) upwardly curved line: it is direct relation with some log factor or square or other root.