Answer:

Step-by-step explanation:
−5x - 3y = 21
+ 5x + 5x
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1) x = - 4 and y = 8
answer is d. last choice
2) x = 16 y =20
answer is d. last choice
3) x - 6y = -24
so -x + 6y = 24
answer is B. second choice
4) 4.75k + 2.25p = 22
answer is a. first choice
5) last graph.
answer is D.
Answer:
The first choice:
,
, and
.
Step-by-step explanation:
.
Add the first row to the second row to obtain:
.
Simplify that matrix to obtain:
.
Divide the second row by
:
.
Hence,
.
Subtract the current row two from row three:
.
Simplify that matrix to obtain:
.
Invert the signs in the third row and divide it by
to obtain:
.
Hence,
.
Subtract two times the current second row from the first row to obtain:
.
That simplifies to
.
Subtract the current third row from the first row to obtain:
.
That simplifies to
.
Invert the signs in the first row to obtain:
.
Hence,
.
.
<span>y = 2(x + 2)^2 - 3 has the form y = a(x-h)^2 + k.
Here, a=2, h=-2 and k=-3.
This is a quadratic function. Its graph is a vertical one which opens up (we know that because a = 2 is positive). Its vertex is (-2, -3). Because the graph opens up, (-2, -3) represents the minimum of this function.
The domain of any and all polynomial(s) includes "all real numbers."
The range is the set of possible outputs (y-values) and is (-3, infinity).</span>