Question

how to locate equations on graph?

Answer 1

y = x²    or y = 3 x +1    equation is given.
Take simple example values of x.  Find the corresponding  values of y.
Take values like x = -2, -1, -1/2, 0, 1/3, 1/2, 1 , 2, 3, 4, 5

plot (x,y) on the graph, by locating it.  Join all the points plotted by straight lines. Connect each point with the next point by a straight line from left to right.

Answer 2

Take simple example values of x.  Find the corresponding  values of y.
Plot (x,y) on the graph, by locating the points.  Join all the points plotted by straight lines. Connect each point with the next point by a straight line from left to right.