Literal equations and formulas

1. solve for x.

4 (x - b) = x

2. Solve for y, then find the value of y when given x = - 2.

6x = 7 - 4y

3. Solve for h

A = 1/2bh

4. Find the width of a rectangle with a perimeter of 90 and a length of 15. Draw and label the rectangle first to set up your problem.

90

15

45

30

1. Solve for x

4 (x-b) = x

4x - 4b = x

4x = x + 4b

3x = 4b

x = 4b/3

2. Solve for y, then find the value of y when given x=-2

6x = 7 - 4y

6x + 4y = 7

4y = 7 - 6x

y = (7 - 6x) / 4

x = - 2

y = (7 - 6 (-2)) / 4

y = (7 + 12) / 4

y = 19/4

y = 4 3/4

3. Solve for h

A = 1/2bh

2A = bh

2A/b = h

4. Find the width of a rectangle with a perimeter of 90 and a length of 15. Draw and label the rectangle first to set up your problem.

90

15

45

30

Perimeter of Rectangles: 2₩ + 2£

90 = 2₩ + 2 (15)

90 = 2₩ + 30

60 = 2₩

30 = ₩

Width is 30.

Remember to draw and label the rectangle