7. What is the length of side a? Help please
2 answers:
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Answer:
1) b =
2)m = -2.5
3)y = 15
4)x=2
Step-by-step explanation:
- subtract 8b from both sides
- subtract 2 from both sides
- divide both sides by 3
- Substitute this value into the equation and if both sides are equal then it is the solution.
2)Simplifying
7m + 32 = 12 + -1m
Reorder the terms:
32 + 7m = 12 + -1m
Solving
32 + 7m = 12 + -1m
Solving for variable 'm'.
Move all terms containing m to the left, all other terms to the right.
Add 'm' to each side of the equation.
32 + 7m + m = 12 + -1m + m
Combine like terms: 7m + m = 8m
32 + 8m = 12 + -1m + m
Combine like terms: -1m + m = 0
32 + 8m = 12 + 0
32 + 8m = 12
Add '-32' to each side of the equation.
32 + -32 + 8m = 12 + -32
Combine like terms: 32 + -32 = 0
0 + 8m = 12 + -32
8m = 12 + -32
Combine like terms: 12 + -32 = -20
8m = -20
Divide each side by '8'.
m = -2.5
Simplifying
m = -2.5
3)Simplifying
16 + -5y = 1 + -4y
Solving
16 + -5y = 1 + -4y
Solving for variable 'y'.
Move all terms containing y to the left, all other terms to the right.
Add '4y' to each side of the equation.
16 + -5y + 4y = 1 + -4y + 4y
Combine like terms: -5y + 4y = -1y
16 + -1y = 1 + -4y + 4y
Combine like terms: -4y + 4y = 0
16 + -1y = 1 + 0
16 + -1y = 1
Add '-16' to each side of the equation.
16 + -16 + -1y = 1 + -16
Combine like terms: 16 + -16 = 0
0 + -1y = 1 + -16
-1y = 1 + -16
Combine like terms: 1 + -16 = -15
-1y = -15
Divide each side by '-1'.
y = 15
Simplifying
y = 15
4)Simplifying
2x + -8x + 1 = 9 + -10x
Reorder the terms:
1 + 2x + -8x = 9 + -10x
Combine like terms: 2x + -8x = -6x
1 + -6x = 9 + -10x
Solving
1 + -6x = 9 + -10x
Solving for variable 'x'.
Move all terms containing x to the left, all other terms to the right.
Add '10x' to each side of the equation.
1 + -6x + 10x = 9 + -10x + 10x
Combine like terms: -6x + 10x = 4x
1 + 4x = 9 + -10x + 10x
Combine like terms: -10x + 10x = 0
1 + 4x = 9 + 0
1 + 4x = 9
Add '-1' to each side of the equation.
1 + -1 + 4x = 9 + -1
Combine like terms: 1 + -1 = 0
0 + 4x = 9 + -1
4x = 9 + -1
Combine like terms: 9 + -1 = 8
4x = 8
Divide each side by '4'.
x = 2
Simplifying
x = 2
Answer:
a : b = 25 : 9
Step-by-step explanation:
(3a - 5b) : (3a + 5b) = 1 : 4
Product of extremes = product of means
(3a - 5b) *4 = (3a +5b) * 1 {Distributive property}
3a * 4 - 5b*4 = 3a + 5b
12a - 20b = 3a + 5b
Add 20b to both sides
12a = 3a + 5b + 20b
12a = 3a + 25b
Subtract 3a from both sides
12a - 3a = 25b
9a = 25b
a:b = 25 : 9