Quiz 1; Math--Algebra

When 4 times the number x is added to 12, the result is 8. What number results when 2 times x is added to 7?

• -1

• 5

• 8

• 9

The graph of the linear function f has intercepts at (a,0) and (0,b) in the xy-plane. If a+b = 0 and a ≠ b, which of the following is true about the slope of the graph of f?

• It is positive

• It is negative

• It equals zero

• It is undefined

In the xy-plane, the point (3,6) lies on the graph of the function f(x) = 3x² - bx + 12. What is the value of b?

• 11

• 13

• -11

• 6

On Saturday afternoon, Armand sent m test messages each hour for 5 hours, and Tyrone sent p test messages each hour for 4 hours. Which of the following represents the total number of messages sent by Armand and Tyrone on Saturday afternoon?

• 9mp

• 20mp

• 5m + 4p

• 5p + 4m

3x + 4y = 23

2y - x = -19

What is the solution (x,y) to the system of equations above?

• (-5,2)

• (3, -8)

• (4, -6)

• (9, -6)