Learn the method of substitution for solving simultaneous equations; a 3 step method:
- step 1 : rearrange one of the two equations to make either x or y the subject
- step 2 : substitute the expression found in step 1 into the other equation and solve for the unknown the equation is now written in terms of
- step 3 : substitute the value obtained in step 2 back into the expression found at the end of step 1 and calculate the other solution
