3 years ago

Pls answer I need hellpplp

Mathematics

1 answer:

IgorC [24]3 years ago

5 0

Answer:

Step-by-step explanation:

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What is the simplified expression for -3(2x-y)+2y + 2(x+y)?

slamgirl [31]

Answer:

$- 3(2x - y) + 2y + 2(x + y) \\ - 6x + 3y + 2y + 2x + 2y \\ = - 4x + 7y$

I hope I helped you^_^

6 0

3 years ago

Read 2 more answers

(1 pt) let t2y′′−5ty′+5y=0. find all values of r such that y=tr satisfies the differential equation for t>0. if there is more

Dafna1 [17]

Let
$y = t^r \\ \\ y' = rt^{r-1} \\ \\ y'' = r(r-1) t^{r-2}$

Substitute into differential equation:
$(r^2 -r) t^r - (5r) t^r + (5) t^r = 0$

Factor out t^r and solve for 'r':
$r^2 - r -5r +5 = 0 \\ \\ r^2 - 6r+5 = 0 \\ \\ (r-5)(r-1) = 0 \\ \\ r = 1, r=5$

8 0

4 years ago

6v+13b=377<br> 4v+9b=259

aleksandr82 [10.1K]

Answer:

v = 13

b = 23

Step-by-step explanation:

To solve this system of equations, we can negate one equation and add it to other to cancel out one variable.

Looking at v and b, the coefficients are 6, 4 and 13, 9, respectively.

It would be easier to use the LCM of 6 and 4

$E_1 : 6v + 13b = 377\\E_2: 4v + 9b = 259\\\\4E_1 + (- 6)E_2:\\24v + 52b = 1508\\-24v - 54b=-1554\\\\0v -2b = -46\\-2b = -46\\b = 23\\\\4v + 9(23) = 259\\4v + 207 = 259\\4v = 52\\v = 13\\\\6(13) + 13(23)\\78 + 299\\377$