Find the value of the expression a - 3b, if a = 4 and b = 6.
Add 2a+3b+c+d, −a+b−c−d and 3a−4b−2c−2d. Find the value of the final expression if a=2, b=3, c=4, d=5. [3 MARKS]
Question 7 (iv)
Simplify these expressions and find their values if x = 3, a = -1, b = -2: 10 - 3b - 4 - 5b