Answer:
B
Step-by-step explanation:
y=x^(2)+4
y=4x
lets solve by substitution
4x=x^2+4
0=x^2-4x+4
0=(x-2)(x-2)
x=2 or x=2
y=4x
y=4*2
y=8
same for the other answer
(2,8)
this system has only one solution: (2,8)
Thus, the correct answer is B (one solution)
Answer:
the answer is B
Step-by-step explanation:
1)
<span>y varies inversely with x </span>
<span>y=k/x , where k is any constant </span>
<span>y=-16 when x=-64 </span>
<span>-16 = k/ (-64) </span>
<span>-16 = k/-64 </span>
<span>k=(-16)(-64) = 1024 </span>
<span>2) </span>
<span>y =k/x , where k is any constant </span>
<span>y=8 when x=3 </span>
<span>8 = k/3 </span>
<span>k=24 </span>
<span>y=24/x </span>
<span>when y=6 </span>
<span>6 = 24/x </span>
<span>6x=24 </span>
<span>x=4 </span>
<span>Missing value is 4 </span>
<span>3) </span>
<span>xy/4=-3 </span>
<span>xy=-12 </span>
<span>y=-12/x </span>
<span>y=kx </span>
<span>k=-12 </span>
<span>4)</span>
Parallel graphs have the same slope. perpendicular has opposite reciprocal slopes. These equations have slopes of -2/5 and 25 so they are neither.
7x-2+=6x+2
Move 6x to the other side. Sign changes from +6x to -6x.
7x-6x-2=6x-6x+2
7x-6x-2=2
x-2=2
Move -2 to the other side. Sign changes from -2 to +2.
x-2+2=2+2
x=4
Answer: x=4