revision sheet (final exam) gr 8

Ahmed earns 8 AED per hour as a tutor. He also receives a weekly bonus of 20 AED if he tutors more than 10 hours in a week.

Which equation represents Ahmed’s weekly earnings, y, based on the number of hours, x, he tutors?

• y=8x+20

• y=8x ,  if  x<10,otherwise y=8x+20

• y=8x ,  if x>10 ,otherwise y=8x+20

• y=20x+8

Analyze the system of equations 2x+4y=8 and 4x+8y =16.

Determine the number of solutions and justify your reasoning by analyzing linear equations .

• No solution; the lines are parallel.

• Infinite solutions; the lines overlap.

• One solution; the lines intersect.

• Two solutions; indicates a system error.

What does Elimination mean?

• a.Restoration

• b.Removal

• C.Introduction

• none

The linear equations 2y+x = 6 in slope intercept form is .

• Y=2x+6    

• x=2y+6

• y= -1/2x +6

• y= -1/2x +3

21. the lines would be congruent if there is

• One point in common                          

•  No point in common

•  Infinitely Many points in common

• none

1. Identify Inputs and Outputs

A water heater making water hot.

• a.Input: Hot water, Output: Cold water

• b.Input: Electricity, Output: Cold water

• C.Input: Cold water, Output: Hot water

• D.Input: Hot water, Output: Electricity

9. f(x)= −x+4 and h(x) = −x−4

(which of the following is correct)?

• a.The slopes differ

• b.The rates of change differ

• C.The y-intercepts differ

• d.The functions have the same y-intercept.