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STALIN [3.7K]
3 years ago
8

Solving for systems: {y=3x+7 &     y=5x-7

Mathematics
2 answers:
steposvetlana [31]3 years ago
8 0
\left\{\begin{array}{ccc}y=3x+7\\y=5x-7\end{array}\right\\\\substitute:\\\\5x-7=3x+7\\5x-3x=7+7\\2x=14\ \ \ \ /:2\\x=7\\\\y=3\cdot7+7=21+7=28\\\\Answer:x=7\ and\ y=28.
irina1246 [14]3 years ago
5 0
Y = 3x + 7
y = 5x-7

Now, we know that y = y

thus,

3x + 7 = 5x-7
3x - 5x = -7 -7

= -2x = -14

thus, -x = -14/-2

thus, x = 7.

Substituting for y,

y = 3x + 7
= 3 x 7  + 7

= 28.

Thus, x = 7, y =28
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Yusef typed a 36 word paragraph in 2/3 minute.what is his typing speed in words per minute
lilavasa [31]
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So 36/(2/3)
Basically saying
36 * (3/2) = 54
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3 years ago
I need this solve really fast.<br> Which sequences are geometric? Select three options.
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Answer:

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4 0
3 years ago
Write with fractional exponents. (do not use parentheses)
qwelly [4]

Answer:

4y^3/2

Step-by-step explanation:

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6 0
3 years ago
0.7 (3s + 4)-1.1s = 7.9
vichka [17]

Answer:

s = 5.1

Step-by-step explanation:

0.7 (3s + 4)-1.1s = 7.9\\

Multiply both sides of the equation by 10

0.7\left(3s+4\right)\cdot \:10-1.1s\cdot \:10=7.9\cdot \:10\\\\= 7\left(3s+4\right)-11s=79\\

Expand

\mathrm{Expand\:}7\left(3s+4\right)-11s:\\\quad 10s+28

Subtract 28 from both sides

10s+28-28=79-28

Simplify

10s=51

Divide both sides of the equation by 10

\frac{10s}{10}=\frac{51}{10}

Simplify

s=\frac{51}{10}\\\\Decimal = 5.1

3 0
3 years ago
Read 2 more answers
Explain the rules for multiplication and division to convert units. How do you know when to multiply and when to divide to conve
Dima020 [189]
Well, units divide and multiply just like numbers. That's why Area is in units of  distance squared (cm × cm = cm²) and volume is cubic distance (m × m × m = m³).

Likewise other mathematical operations can be performed on them, including division where they can cancel out of the equation.

For instance, a rate, speed, slope or conversion factor is usually one unit divided by another unit. Like so...

speed = 5 meters per second
= \frac{5m}{1sec}

If you are given a distance traveled, let's say 100 meters and asked to solve for time it takes to get there. You would divide by the speed so that meters cancel leaving only time.

** Of course to divide by a fraction is to flip and multiply so really you're just multiplying by it, making sure the same units are diagonal and cancel out like so:

100 m *  \frac{1sec}{5m} = 20 sec


Hope this helps!

4 0
3 years ago
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