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1 year ago

Y = x - 4 2x + y = 5 solve for x and y

Mathematics

2 answers:

likoan [24]1 year ago

6 0

Answer:

X = 2

Y = 1

Step-by-step explanation:

STALIN [3.7K]1 year ago

5 0

Solve by substitution

$y = x - 4 \\ 2x + y = 5 \\ \\ y = x - 4 \\ 2x - 5 = - y \\ \\ y = x - 4 \\ - y = 2x - 5 \\ \\ add \: the \: two \: equations \\ \\ 0 = 3x - 9 \\ 9 = 3x \\ \frac{9}{3} = \frac{3x}{x} \\ x =3 \\ \\ substitute \: 3 \: for \: x \: in \: one \: of \: the \: equations \: to \: find \: y \\ \\ y = x - 4 \\ y = 3 - 4 \\ y = - 1 \\ \\ solution \: (3. - 1)$

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What the value of r that makes the value true? r+(-0.14)=0.47

siniylev [52]

$r+(-0.14)=0.47\\\\r-0.14=0.47\qquad|\text{add 0.14 to both sides}\\\\r-0.14+0.14=0.47+0.14\\\\r=0.61$

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3 years ago

The graph represents a person’s heart rate in beats per minute during 30 minutes of exercise. Which statement best describes th

DanielleElmas [232]

We know that

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The heart rate increases for 6 minutes, remains constant for 19 minutes, and then gradually decreases for 5 minutes..........Answer

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4 years ago

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lianna [129]

Answer: 8c

Step-by-step explanation:

We do not know the value of c or the other c.

So, the answer to the question is 8c. Hope it helped.

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3 years ago

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HELP ASAP PLEASE ONLY #4,6,8,10,12,14,16

ExtremeBDS [4]

Answer:

Step-by-step explanation:

Oof, all 6? That's not fun.

I'm going to show you one for the first bunch, (4-12) and hopefully you can get the rest. If not let me know and I can more carefully work you through some others on here.

4) So first we need the angle. How do we find that? Well, we know it's somewhere between 270 and 360 degrees (or 3pi/2 and 2pi radians) since it's in the fourth quadrant. The method to finding the angle is ifferent for each quadrant, but it's nice to know around where you'll get. Anyway,, if we take 360 and subtract that little space that is unlabeled we will know the rest. Hopefully that makes sense, but let me know if not, it's important to understand. Maybe think of what happens if you add the two together, you get around the whole circle then.

Anyway, to find that little sliver, we are going to construct a right triangle wherethe x axis is one side. If you draw a line connecting point p and the x axis you have this right triangle. I am going to call this sliver we don't know s. ANyway, now we use trig here.

s = arcsin(3/5) (you can find 5 pretty easily but let me know if you don't see it.)

You may think to use -3 instead of 3, and it wouldn't be a huge mistake, it will just give you the negative version of what we want.

Anyway, now we know theta is 360-s (or 2pi-s). You can solve s or leave it as arcsin(3/5) so you don't have to round.

Now we can solve the trig functions. If you don't know the sum and difference trig identities you will have to round. They are pretty simple formula though. For instance, sin(2pi - arcsin(3/5)) = sin(2pi)cos(arcsin(3/5))-cos(2pi)sin(arcsin(3/5)) = 0 - 3/5 = -3/5 You will also want to know that s = arcsin(3/5) = arccos(4/5) = arctan(3/4). ROunding will get you close but not exact.

Again, let me know ifyou need any more help, they should just be a lot of doing the same thing over and over and over again though.

14) For 14 and 16 you just need to know how the graphs of sin, cos and tan look. Is this something you have trouble with? Like could you draw the graphs at the intervals of increasing/ decrasing and all. if not I can give a quick explanation.

7 0

3 years ago

Help me please, and show your steps! Jerome has 1/2 of the group's video games at his house. Mario has 2/5 of the group's video

pochemuha

Answer: $\frac{9}{10}$

Step-by-step explanation:

According to the information given in the exercise, you know that:

$\frac{1}{2}$ of the group's video games is at Jerome's house.

$\frac{2}{5}$ of the group's video games is at Mario's house.

Then, you need to add those fractions in order to solve the exercise.

Notice that the denominators of the fractions are different; so in this case, you need to multiply them in order to find the Least Common Denominator (LCD). This is:

$LCD=2*5=10$

Now, the procedure is:

1- Divide each original denominator by the LCD and multiply the numerators by the quotient obtained.

2- Add the products (This sum will be the numerator).

Then, you get the following result:

$\frac{1}{2}+\frac{2}{5}=\frac{(1)(5)+(2)(2)}{10}=\frac{5+4}{10}=\frac{9}{10}$

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3 years ago