Use Sum and Difference Together - Practice 1

5 questions0m 0s

Learn the skill

Add the two equations to remove one variable when its coefficients are opposites. Then solve the simpler equation and check both originals.

Worked example

x + y = 10 and x - y = 4 add to 2x = 14, so x = 7 and y = 3.

Question 1 Solve x + y = 5 and x - y = 3. What is x? Answer

Question 2 Solve x + y = 7 and x - y = 3. What is x? Answer

Question 3 Solve x + y = 9 and x - y = 3. What is x? Answer

Question 4 Solve x + y = 8 and x - y = 6. What is x? Answer

Question 5 Solve x + y = 10 and x - y = 6. What is x? Answer