exam Maths Puzzle Numerical Ability

Can someone explain how I am supposed to solve by substitution with the problems x-y=5 x+2y=7 and 3b+2a=2 -2b+2a=8

Read Solution (Total 0)

exam Other Question

x^2+xsqrt2-2=0 Becky has as many dimes as Ryan and Amy have together. Ryan has 2 more dimes than Amy, and Amy has one-third as many dimes as Becky has. How many dimes does each have?