Substitute Variables to Determine Equivalency

Which answer has a correct first step for this system:

• The variable is already isolated, so we've already solved the system.

• The variable is already isolated for y, so we substitute it in the first equation and solve for x

  3x + 3(3x + 5) = 3

• Free sha vaca doo

• The variable is already isolated for y, so we substitute it in the second equation and solve for x

  y = 3(3x + 3y) = 3

• (-8, -5)

• No Solution

• Infinite number of solutions

• (-8, 5)

What is the solution to the equations?

• one solution

• no solution

• infinite solutions

• none of these

Evaluate the expression: x + 2 when x = 6

• 8

• 4

• 12

• 10

What is the first thing you do when evaluating an expression

• Substitute value in for the variable

• Combine like terms

• Parenthesis

3x + 8   if x = 2

• 13

• 14

• 15

• 16

Evaluate 2a + 4b 
if a = 10     and    b = 6

• 20

• 24

• 44

• 4

Evaluate expression if a=3 and b=4

18 ÷ 2a

• 3

• 2.25

• 27

• 9

6q +m - m when m =8 and q= 3

• 63

• 24

• 18

• 1

4 + 6b, b=3

• 67

• 13

• 22

• 13