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poizon [28]
2 years ago
9

Solve by substitution 3x-4y=-4 y=2x-4

Mathematics
1 answer:
dybincka [34]2 years ago
7 0

Answer:

x=4 and y=4

Step-by-step explanation:

From first function we have:

3x - 4y =  - 4 \\ 4y = 3x  + 4

And from the second one:

y = 2x - 4 \\ 4y = 8x - 16

Substitute them:

4y = 3x + 4 \\ 4y = 8x - 16 \\  \\ 0 =  - 5x + 20 \\ x = 4 \\ y = 4

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Please help need it for school and need 20 characters which is like really but pls help solve
vampirchik [111]
a^{log_a(b)}=b also
ln=log_e



e^{2x-3}=11
take the ln of both sides
2x-3=ln(11)
add 3 to both sides
2x=3+ln(11)
dividie both sides by 2 or times 1/2
x=1.5+0.5ln(11) or x= \frac{3}{2}+ln \sqrt{11}
3 0
3 years ago
A flower arrangement has 8 carnations for every 4 roses. There are 14 carnations. How many roses are in the arrangement?
soldier1979 [14.2K]

Answer:

There are 7 roses

Step-by-step explanation:

<u>Step 1:  Find the ratio</u>

8 : 4

(8/4) : (4/4)

2 : 1

There are 2 carnations for every rose.

<u>Step 2:  Find the amount of roses</u>

7 * 2 : 7 * 1

14 : <u>7</u>

Answer:  There are 7 roses

6 0
3 years ago
What’s the Lcm of 28,42 and 63
Rzqust [24]

Answer:

252 is the least common multiple

Step-by-step explanation:

4 0
3 years ago
What is the ordinate of the point where the graph of the<br> equation y = 5x + 2 crosses the y-axis?
eimsori [14]

Answer:

(0,2)

Step-by-step explanation:

in any y = mx + b formula, b is always the y intercept, and the y intercept is just a fancy name for where the line first crosses the y axis. hope this helps!

8 0
2 years ago
In a particular triathlon the athletes cover 1/24 of the total distance by
pav-90 [236]

Answer:

15/8

Step-by-step explanation:

Let "d" be the total distance, that is, the distance for swimming (s), running (r) and going by bike (b).

d = s + r + b   [1]

1/24 of the total distance is covered by  swimming.

s = 1/24 d   [2]

1/3 of the distance is covered by running.

r = 1/3 d  [3]

If we replace [2] and [3] in [1], we get

d = 1/24 d + 1/3 d + b

b = d - 1/24 d - 1/3 d

b = 24/24 d - 1/24 d - 8/24 d

b = 15/24 d = 5/8 d

The ratio of  the distance covered by bike to the distance covered by running is:

b/r = (5/8 d)/(1/3 d) = 15/8

5 0
2 years ago
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