Solve for y 4.2x - 1.4y = 2.1

1 answer:

8 0

4.2x - 1.4y = 2.1 |multiply both sides by 10

42x - 14y = 21 |subtract 42x from both sides

-14y = 21 - 42x |change signs

14y = 42x - 21 |divide both sides by 14

y = 3x - 1.5

You might be interested in

.<br><br> y = x2 + 3<br> y = x + 5

ddd [48]

I assume you mean x squared in the first equation

Because both are equal to y, they are equal to each other so x + 5 = x^2 +3
If we then move everything over to one side, we get x^2 - x - 2 = 0

Then factorise it to (x-2)(x+1) = 0
And solve both parts separately

x + 1 = 0
x = -1

x-2 = 0
x = 2

Sub both values into the simplest equation in this case y=x+5
to get y = 4 and y = 7

7 0

1 year ago

Two cylindrical cans have the same volume. the height of one can is triple the height of the other. if the radius of the narrowe

Tju [1.3M]

Find the attachment below....

7 0

2 years ago

Zoe placed colored blocks on a scale in science class. Each block weighed 0.8 ounces. The total weight of all the colored blocks

s344n2d4d5 [400]

Answer:

16 blocks. 12.8=(.8)x

Step-by-step explanation:

3 0

2 years ago

Read 2 more answers

Dorothy Little purchased a mailing list of 2,000 names and addresses for her mail order business, but after scanning the list sh

andrew-mc [135]

Answer:

$P(X > 0) = 0.9222$

Step-by-step explanation:

For each name, there are only two outcomes. Either the name is authentic, or it is not. So, we can solve this problem using the binomial probability distribution.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.\pi^{x}.(1-\pi)^{n-x}$