G10. WUA_14.1

p = 7, q = 4 is the solution of the simultaneous equations p – q = 3 and:

• p – 2q = 1

• p – 2q = –1

• p + 2q = 1

Which of the following does not have c = –1, d = 4 as a solution?

• c = 3 – d

• d – 2c = 6

• d = 6 – 2c

Mark paid $2.40 for 8 apples while Jenny paid the same amount for 2 apples and 3 oranges.

Which statement is true?

• Apples cost $0.60 each and oranges cost $0.40 each.

• Apples cost $0.30 each and oranges cost $0.60 each.

What is the solution to the equations y = 1 + x and y = 4 – 2x?

The solution is x = 1, y = ...

Mathematical Equivalence

ON

Mathematical Equivalence

ON

5a – 3b = 7        (i)
3a + 4b = –1      (ii)

You want to eliminate a by subtraction.

Multiply eqn (i) by 3 and eqn (ii) by ... 

Mathematical Equivalence

ON

4a – c = 20      (i)
2a + c = 4       (ii)

What is the solution of these simultaneous equations?

a = 4 and c = ....

Mathematical Equivalence

ON