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Algebra 1 Name: _____________________________ 3rd Nine Weeks Review Solve the equation. Show your work! 1. 2𝑥 − 4 = 6𝑥 + 8 Solve the inequality. Show your work! 2. 5 + !
!≥ −7
Graph each inequality. 3. 𝑥 ≤ 7 4. 𝑥 > −3 5. Find 𝑓 2𝑥 + 7 if 𝑓 𝑥 = 3 − 4𝑥 Graph each transformation. 6. 𝑦 = − 𝑥 + 2 ! − 1 7. 𝑦 = 𝑥 − 3 + 2 8. What is the slope of the line that passes through (-‐3, 2) and (8, 6)? 9. What is the equation of the line that goes through the point (6, 4) with a slope of !
!? (Put in slope-‐intercept form.)
10. Write the equation of the line in point-‐slope form that goes through (-‐4, 2) and has a slope of -‐7? 11. Write the following equation is slope-‐intercept form. 3𝑥 + 6𝑦 = 9 12. Write the following equation in standard form. (Make sure your answer follows all the standard form rules!) 𝑦 = 8𝑥 − 3 Are the following lines parallel, perpendicular, or neither? 13. 𝑥 + 4𝑦 = 8 14. 𝑦 = −7𝑥 + 4 𝑦 = − !
!𝑥 + 6 𝑦 = !
!𝑥 − 3
15. Find the x and y intercepts of the equation 3𝑥 − 4𝑦 = 12. Find the inverse of each function. 16. 𝑓 𝑥 = 9 + 3𝑥 17. 𝑓 𝑥 = !
!!− 4
18. Solve the system of equations by graphing. 𝑦 = −2𝑥 + 1 𝑦 = 3𝑥 − 4
Solve each system of equations using substitution. 19. 𝑦 = 5𝑥 + 2 20. 3𝑦 + 2𝑥 = 0 3𝑥 − 2𝑦 = 3 𝑥 = 𝑦 − 10 Solve each system of equations using elimination. 21. 3𝑥 + 5𝑦 = 8 22. 4𝑥 + 4𝑦 = 8 −3𝑥 + 𝑦 = 4 2𝑥 + 𝑦 = 2 Simplify. 23. 24. 25. 26. 27. Paul invested $400 into an account with a 7.5% interest rate compounded monthly. How much will Paul’s investment be worth in 8 years? 28. Ms. Smith received a job as a teacher with a starting salary of $34,000. According to her contract, she will receive a 1.5% increase in her salary every year. How much will she earn in 7 years?