(a) Solve 7x + 3 = x – 18
x =
(2)
(b) Make w the subject of t = 7w + 3
(2)
Pencils cost 2 dollars each.
Rulers cost 3 dollars each.
Edith buys p pencils and r rulers.
The total cost is T dollars.
(c) Write down a formula for T in terms of p and r
.
(3)