Step 1 :
Step 2 :Multiply the second equation by 2 to make the coefficients of x the same:
Step 3 :Add the two equations:
Step 4 :Simplify:
Step 5 :Substitute x back into the first equation:
Step 6 :Simplify:
Step 7 :Subtract 2 from both sides:
Step 8 :Multiply both sides by
Step 9 :