### simultaneous eqns & concrete strength

1. Solve graphically the following simultaneous equations: y = 10 - 2x y = x - 1 2. Plot the graph of: y = x^2 - 2x - 4 for values of x from x = -2 to x = 4 at intervals of 1 and use the graph to solve the quadratic equation x^2 - 2x - 4 = 0. 3. The following grouped frequency table shows the compres