To plot the graphs of linear equations, you can simply sub in certain values of x and then find out the value of y when x is that value

For example, for the linear equation 5x - 2y = 4, we can try subing in the value of x = 0 and x = 2.

For x = 0,
5(0) - 2y = 4
-2y = 4
y = 4/(-2)
y = -2
Therefore, when x = 0, y = -2

For x = 2,
5(2) - 2y = 4
10 - 2y = 4
-2y = 4 - 10 = -6
y = (-6)/(-2)
y = 3
Therefore, when x = 2, y =3

From these, you can plot the points of (0,-2) and (2,3), and then draw a line that intersects these two points for the graph of 5x - 2y =4

You can then repeat this process for the other equation as well