GRADE EIGHT ALGEBRA RECAP !! :D

Transposition

100

P = mgh (h)

h = P/mg

200

v = 2aw - h (w)

w = (v+h)/2a

300

s = (t-2)/3 (t)

t = 3s + 2

400

x = (4t - k)/n (t)

t = (nx + k)/4

500

p = (r² - 3)/4 (r)

r = sq. root (4p + 3)

Equations

100

x - 6 = 10, what is the value of x?

x = 16

200

4n - 2n = 10, what is the value of n?

n = 5

300

-3(x + 2) = 6, what is the value of x?

x = -4

400

sq. root (3x - 2) = 5, what is the value of x?

x = 9

500

4n + 5 = 3n + 12, what is the value of n?

n = 7

Inequalities

100

Solve the inequality: x + 4 > 9

x > 5

200

Solve the inequality: 6x - 7 < 5

x < 2

300

Solve the inequality: 3 - 2(n - 4) > -1

n < 5

400

Solve the inequality: 26 + m > 5(-6 + 3m)

m < 4

500

Solve the inequality: -3 < 2x + 3 < 9

-3 < x < 6

Worded Questions

100

If six is subtracted from a number, then we get 5. What is the number?

Eleven (11)

200

The difference between x and 10 is greater than 3. Write and inequality and solve.

x > 13

300

When I think of a number, double it, then add seven, i get 25. What number did I think of?

Nine (9)

400

The three angles of a triangle are (x - 25), (2x + 40) and 30. Find the measurement of each angle.

20 degrees, 130 degrees, 30 degrees

500

The sum of a number and 3 is less than the difference between two times a number and twenty-one. Write an inequality ro represent the information and solve.

-6 < x