X+y=10 x-y=20 how do you solving systems of equations with elimination

Answers

Answer 1
Answer: x+y=10\n \underline{x-y=20}\n2x=30\nx=15\n\n15+y=10\ny=-5\n\n\boxed{(x,y)=(15,-5)}

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Find the possible value or values of n in the quadratic equation 2n2 – 7n + 6 = 0.

Answers

2(n+7)(n-1)=0
because 7(-1) = -7 thats how you would get 7n and 7 - 1= 6 thats how you would get +6 and to be more specific it would be
n+7=0                       n-1=0
n=-7                          n= 1

Select all the fractions that are equivalent to 4.05

Answers

Answer:81/20 or 405/100

Step-by-step explanation:

What is the value of x?

20
35
60
70

Answers

Answer:

20

Step-by-step explanation:

Answer:

∠TRS and ∠VRW equal because they are opposed by the vertex

x+40 = 3x

x-3x=-40

-2x=-40

x= 40/2 = 20°

∠TRS = x+40 =20+40=60°

∠VRW = 3x= 20*3 =60°

Step-by-step explanation:

Which is equivalent to (9y2 – 4x)(9y2 + 4x), and what type of special product is it?81y4 – 16x2, a perfect square trinomial
81y4 – 16x2, the difference of squares
81y4 – 72xy2 – 16x2, a perfect square trinomial
81y4 – 72xy2 – 16x216, the difference of squares

Answers

Consider the expression (9y^2- 4x)(9y^2 + 4x) . You can see that in both brackets are the same terms 9y^2 and 4x, but signs are different. So you can use formula for the difference of squares:

a^2-b^2=(a-b)(a+b).

According to this formula,

(9y^2-4x)(9y^2+4x)=(9y^2)^2-(4x)^2=9^2\cdot (y^2)^2-4^2\cdot x^2=81y^4-16x^2.

Answer: correct choice is B.

The sum of x and 4 is greater than the difference of 2x and 3. Find x

Answers

Answer:

3 i think

Step-by-step explanation:

add 3 and 4 =7

or

multiply 2 and 3= 6 and subtract 3 = 3

The first order was 13 bushes and 4 trees for a total of $487 the second order was 6 bushes and 2 trees for a total of $232 what were the costs of one bush and of one tree

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