Homework #1: Solving Systems of Linear Equations by Sub (Basic)

If a = 4 and b = 6, what is the value of 3a + 5b?

• 40

• 42

• 44

• 46

Work out the value of the following expressions when a = 3, b = 4 and c = 5.
2a² + c²   

• 22

• 34

• 68

• 43

Work out the value of the expression when x = 3, y = – 2 and z = – 4.
2x² + z²   

• 2

• 27

• 50

• 34

What is the solution?

• (6, 3)

• (3, 6)

• (-6, 3)

• No solution

• No Solution
  

x = 3

y = 2x + 5

• (11,3)

• (3,11)

• No Solution

• (3,10)

• (1, -4)

• (1, 4)

• (-4, -7)

• (-7, -4)

Solve for x:

2x - 3 + 4x = 27

• x = 12

• x = 4

• x = 5

• x = 15