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ValentinkaMS [17]
4 years ago
9

PLEASE help!! I need help with this quick!!!! I partly know how to do this, but not 100%. Use the linear combination method to s

olve the system of equations. Explain each step of your solution.
2x - 3y = 13
x + 2y = -4
Your step by step will help me get this down.
Mathematics
1 answer:
ira [324]4 years ago
5 0
Add the equations in order to solve for the first variable. PLug this value into the other equations in order to solve for the remaining variables.
The answer is:
(2, -3)
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HELP TRUE OR FALSE QUESTIONS
larisa [96]

Answer:

I provided a picture with the answers

Step-by-step explanation:

5 0
3 years ago
Find the vertex of this parabola:<br> y = -x2 + 6x – 15
Orlov [11]

y =  - x {}^{2}  + 6x - 15

y {}^{  \gamma  }  =  - 2x + 6

y {}^{ \gamma }  = 0

- 2x + 6 = 0

- 2x =  - 6

2x = 6

x = 3

<h3>Substitute x=3 in y=-x²+6x-15</h3>

y =  - (3) {}^{2}  + 6(3) - 15

y =  - 9 + 18 - 15

y =  - 9 + 3

y =  - 6

<h2><em>Vertex:</em><em> </em><em> </em><em>(</em><em>3</em><em>,</em><em>-</em><em>6</em><em>)</em></h2>
8 0
3 years ago
Read 2 more answers
Find positive numbers a and b so that the change of variables s=ax,t=by transforms the integral ∫∫rdxdy into ∫∫t∣∣∣∂(x,y)∂(s,t)∣
densk [106]
S = ax
It is required to find the value of a which make:
0 ≤ s ≤ 1 when <span>0 ≤ x ≤ 15
∴ s = 0 when x = 0     ⇒⇒⇒ a = 0 (unacceptable)
or s = 1 when x = 15  ⇒⇒⇒ a = s/x = 1/15

Similarly, t = by </span>
<span>It is required to find the value of b which make:
0 ≤ t ≤ 1 when <span>0 ≤ y ≤ 60
∴ t = 0 when y = 0     ⇒⇒⇒ b = 0 (unacceptable)
or t = 1 when y = 60  ⇒⇒⇒ b = t/y = 1/60

a =  \frac{1}{15} \ \ \  and \ \ \ b=  \frac{1}{60}
</span></span><span>
</span><span>∴ x = 15s  and  y = 60t

J ( \frac{x,y}{s,t}) =   \left[\begin{array}{ccc} \frac{dx}{ds} & & \frac{dx}{dt} \\ & & \\ \frac{dy}{ds} & & \frac{dy}{dt} \end{array}\right] =   \left[\begin{array}{ccc}15& &0\\ & & \\0& &60\end{array}\right] = 900

Note: it is not matrix it is determinant</span>
8 0
3 years ago
<img src="https://tex.z-dn.net/?f=%20-%206x%20%2B%205%20%5Cgeqslant%2011" id="TexFormula1" title=" - 6x + 5 \geqslant 11" alt="
Lesechka [4]

Answer:

Step-by-step explanation:

-6x + 5 ≥ 11

-6x ≥ 6

x ≤ -1

7 0
3 years ago
A cube has an edge of 2 feet. The edge is increasing at the rate of 5 feet per minute. Express the volume of the cube as a funct
Agata [3.3K]

Answer:

V(m) = (2 + 5m)^3

Step-by-step explanation:

Given

Solid Shape = Cube

Edge = 2 feet

Increment = 5 feet per minute

Required

Determine volume as a function of minute

From the question, we have that the edge of the cube increases in a minute by 5 feet

<em>This implies that,the edge will increase by 5m feet in m minutes;</em>

Hence,

New\ Edge = 2 + 5m

Volume of a cube is calculated as thus;

Volume = Edge^3

Substitute 2 + 5m for Edge

Volume = (2 + 5m)^3

Represent Volume as a function of m

V(m) = (2 + 5m)^3

4 0
3 years ago
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