All categories

3 years ago

PLEASE HELLLP!!!!! If x+7=2y and y=2x−1, what is the value of y? (NOT 13)

Mathematics

1 answer:

oee [108]3 years ago

5 0

Answer:

Step-by-step explanation:

x+7=2y

Subtract 7 from both sides

x=2y-7

2y-7=x

Multiply both sides by 2

4y-14=2x

y=2x−1

Add 1 to both sides

y+1=2x

Combine equations:

y+1=4y-14

Add 14 to both sides

y+15=4y

Subtract y from both sides

15=3y

3y=15

Divide both sides by 3

y=5

The answer is (C) 5.

You might be interested in

Section 5.2 Problem 17:

Elina [12.6K]

This DE has characteristic equation

$4r^2 - 12r + 9r = (2r - 3)^2 = 0$

with a repeated root at r = 3/2. Then the characteristic solution is

$y_c = C_1 e^{\frac32 x} + C_2 x e^{\frac32 x}$

which has derivative

${y_c}' = \dfrac{3C_1}2 e^{\frac32 x} + \dfrac{3C_2}2 x e^{\frac32x} + C_2 e^{\frac32 x}$

Use the given initial conditions to solve for the constants:

$y(0) = 3 \implies 3 = C_1$

$y'(0) = \dfrac52 \implies \dfrac52 = \dfrac{3C_1}2 + C_2 \implies C_2 = -2$

and so the particular solution to the IVP is

$\boxed{y(x) = 3 e^{\frac32 x} - 2 x e^{\frac32 x}}$

8 0

2 years ago

Which of the following is a solution of x2 + 4x + 10?

sattari [20]

X^2+4x+10=0

x^2+4x=-10

x^2+4x+4=-6

(x+2)^2=-6

x+2=±i√6

x=-2±i√6

So the correct answer is the third one down from the top.

3 0

3 years ago

Read 2 more answers

What is the surface area of cone below Diameter AB=21 and distance from B to C =36

Vesnalui [34]

Answer:

1533.88261311522

Step-by-step explanation:

Let r be the radius of the (base/circle)

and L be the slant height of the cone

Formula ………………………………………………………………………………………………………

The surface area of a cone = the (curved/lateral) surface area + the base

$=\pi r^{2}\ \ \ +\ \ \ \pi Lr$

=========================================

$r=\frac{21}{2} =10.5$

L = BC = 36

$\text{surface area} =\pi \left( 10.5\right)^{2} +\pi \times 36\times \left( 10.5\right)$

$=346.360590058275 + 1187.52202305694$

$=1533.88261311522$

6 0

2 years ago

Kinda need help on both of these, will give brainliest btw

MissTica

Answer:this is gonna help you sm

Step-by-step explanation:

There’s an all called photo math, download it on ur phone and ur set

3 0

3 years ago

6*(2x+3)-(4x+2)=32 what is X?

nydimaria [60]

Answer:

6*(2x+3)-(4x+2)=32

answer is x=2

3 0

3 years ago