Find x and y intercepts for both equations by putting y=0 and finding x, then putting x=0 and finding y.
1st eqn: -5x=3, so x intercept=-3/5; 3y=3, so y intercept=1.
2nd eqn: 4x=30, so x intercept=15/2; 3y=30, so y intercept=10.
Draw a straight line to pass through the x and y intercepts for each line and where the lines cross is the solution of the two equations. The lines should cross at the point (3,6), so x=3, y=6 is the solution.