Find the difference (4ab-9a-8)-(7ab-1)

1 answer:

7 0

(4ab - 9a - 8) - (7ab - 1)
distribute (multiply) the negative through the parenthesis
(4ab - 9a - 8) - 7ab + 1
No need for other parenthesis because nothing in front or to combine inside. 
4ab - 9a - 8 - 7ab + 1 
Combine like terms
- 3ab - 9a - 7

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Solve the following system of equations algebraically: y = x^2+7x−4 y = −x−4

oksian1 [2.3K]

Y = x² + 7x - 4
y = -x - 4

x² + 7x - 4 = -x - 4
+ x + x
x² + 8x - 4 = -4
+ 4 + 4
x² + 8x = 0
x(x) + x(8) = 0
x(x + 8) = 0
x = 0 or x + 8 = 0
   - 8 - 8
x = -8

  y = -x - 4
  y = -0 - 4
  y = 0 - 4
  y = -4
(x, y) = (0, -4)
or
y = -x - 4
y = -(-8) - 4
y = 8 - 4
y = 4
(x, y) = (-8, 4)

The solutions are (0, -4) and (8, -4).

7 0

3 years ago

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A family earns $523 from a yard sale. They pay $45 in advertising fees. What's the family's profit from the yard sale Use formul

xeze [42]

$478 by using the provided formula ...
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6 0

3 years ago

6 = 2 (y + 2) find X please

Elena-2011 [213]

Answer: y = 1

there no x, i think you meant y?

Step-by-step explanation:

Step 1: Simplify both sides of the equation.

6=2(y+2)

6=(2)(y)+(2)(2)(Distribute)

6=2y+4

Step 2: Flip the equation.

2y+4=6

Step 3: Subtract 4 from both sides.

2y+4−4=6−4

2y=2

Step 4: Divide both sides by 2.

2y over 2 = 2 over 2

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3 years ago

If Sin 3x= Cos (x-60), find the value of x

Kamila [148]

Answer:

x = 15

Step-by-step explanation:

Assuming 3x and x-60 are in degrees, you can use:

cos(a) = sin(a+90)

To rewrite the equation as:

sin(3x) = sin(x-60+90)

sin(3x) = sin(x+30)

3x = x+30

2x = 30

x = 15

But, solving 3x = x+30 which simplifies to x=15 is not the only solution to this equation, as you can see in below picture. Finding all solutions is a bit more work, but maybe that is not required in your case.