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BabaBlast [244]
3 years ago
13

Solving using substitution Y=4 8x-y=-12

Mathematics
2 answers:
rusak2 [61]3 years ago
6 0
Plug y=4 into equaton
8x-4=-12
add 4 to both sides
8x=-8
divide both sides by 8
x=-1

x=-1
y=4
(-1,4)
Sophie [7]3 years ago
5 0
To solve this, you need to substitute the value of Y into the equation 8X - Y = -12

So, since Y = 4, plug 4 in for Y:

8X - Y = -12
8X - (4) = -12

Now solve for X.

Does that help? Do you have any questions?

Just as a heads up this technique also works for larger equations. If Y = 3X, then you'd just plug 3X in for Y:

8X - Y = -12
8X - (3X) = -12

You got this!
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If the length of a rectangle is a two-digit number with identical digits and the width is 1/10 the length and the perimeter is 2
Oksanka [162]

If the length of a rectangle is a two-digit number with identical digits and the width is 1/10 the length and the perimeter is 2 times the area of the rectangle, what is the the length and the width

Solution:

Let the length of rectangle=x

Width of rectangle=x/10

Perimeter is 2(Length+Width)

= 2(x+x/10)

Area of Rectangle= Length* Width=x*x/10

As, Perimeter=2(Area)

So,2(x+x/10)=2(x*x/10)

Multiplying the equation with 10, we get,

2(10x+x)=2x²

Adding Like terms, 10x+x=11x

2(11x)=2x^2

22x=2x²

2x²-22x=0

2x(x-11)=0

By Zero Product property, either x=0

or, x-11=0

or, x=11

So, Width=x/10=11/10=1.1

Checking:

So, Perimeter=2(Length +Width)=2(11+1.1)=2*(12.1)=24.2

Area=Length*Width=11*1.1=12.1

Hence, Perimeter= 2 Area

As,24.2=2*12.1=24.2

So, Perimeter=2 Area

So, Answer:Length of Rectangle=11 units

Width of Rectangle=1.1 units

7 0
3 years ago
Read 2 more answers
Which statement is true about the discontinuities of the function f(x)?
Leno4ka [110]

Answer:

  (a)  There are asymptotes at x=3/2 and x=-1/3

Step-by-step explanation:

The denominator zeros can be found by factoring:

  f(x) = (x +1)/((2x -3)(3x +1))

Neither of the denominator factors is cancelled by the numerator factor, so each represents a vertical asyptote, not a function hole.

The asymptotes are at the values of x where the denominator is zero:

  2x -3 = 0   ⇒   x = 3/2

  3x +1 = 0   ⇒   x = -1/3

8 0
2 years ago
Help me with number question 7
oksano4ka [1.4K]
Just use the Pythagorean Theorem
(9 +x)^2 = 15^2 + x^2
x^2 + 18x + 81 = 225 + x^2
18x = 144
x = 8
 So the three sides of the triangle are
15, 8 and 17


5 0
3 years ago
A membership at a yoga studio costs $35 per month. Write an equation for the cost of the membership, c, that you pay if you keep
Usimov [2.4K]
Since there is no base down payment or anything the equation i think would just be 35m = c
If there was say a one time payment of $20 and then the monthly payments it would look like 20+35m=C
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6 0
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insens350 [35]

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Scale factor is 2/5 or 0.4

Step-by-step explanation:

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