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ollegr [7]
3 years ago
13

Steps to solve this equation.

Mathematics
2 answers:
Scrat [10]3 years ago
8 0
-4x+9y=28
-4x-y=-28

Solve for one variable in either equation, then substitute it in the other equation to find the other variable.

-4x+9y=28
Add 4x to both sides
9y=28+4x
Divide both sides by 9
y=(28+4x) / 9

-4x-y=-28
-4x- ((28+4x) / 9)= -28
-4x-28/9-4x/9=-28
Multiply everything by -9 to get rid of denominators
(-9)(-4x)-(-9)(28/9)-(-9)(4x/9)=(-9)(-28)
36x+28+4x=252
40x+28=252
Subtract 28 from both sides
40x=224
Divide both sides by 40
x=5.6

Substitute x=5.6 back in to now solve for y.
-4x+9y=28
(-4)(5.6)+9y=28
-22.4+9y=28
Add -22.4 to both sides
9y=50.4
Divide both sides by 9
y=5.6

Hope this helps! :)
Leokris [45]3 years ago
5 0
Solve the following system:
{9 y - 4 x = 28 | (equation 1)
{-4 x - y = -28 | (equation 2)

Subtract equation 1 from equation 2:
{-(4 x) + 9 y = 28 | (equation 1)
{0 x - 10 y = -56 | (equation 2)

Divide equation 2 by -2:
{-(4 x) + 9 y = 28 | (equation 1)
{0 x+5 y = 28 | (equation 2)

Divide equation 2 by 5:
{-(4 x) + 9 y = 28 | (equation 1)
{0 x+y = 28/5 | (equation 2)

Subtract 9 × (equation 2) from equation 1:
{-(4 x)+0 y = (-112)/5 | (equation 1)
{0 x+y = 28/5 | (equation 2)

Divide equation 1 by -4:
{x+0 y = 28/5 | (equation 1)
{0 x+y = 28/5 | (equation 2)

Collect results:
Answer:   {x = 28/5
                 {y = 28/5
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Please help me with this question
mihalych1998 [28]

Answer:

John and Pam are paid $8.5 for each hour worked. John's share of the money is $29.75.

Step-by-step explanation:

Let x = the hourly salary. John worked for 3.5 hrs, and Pam for two. We can represent this using the equation:

3.5x + 2x = 46.75, where the coefficients equals the amount of hours.

Let's solve for x!

5.5x=46.75

x = 46.75/5.5 = 17/2 = 8.5

John and Pam are paid 8.5 dollars per each hour worked.

To figure out John's share of the money, we will multiply the wage by the hours he worked.

8.5 x 3.5 = 29.75

8 0
3 years ago
PLS HELP BEST ANSWER GETS BRAINLIEST
Blizzard [7]
Answer: 4 cakes
Explanation: 2/3 is equal to 4/6. Each cake only takes 1/6 lbs. of sugar
4 0
3 years ago
Owen ate three-eighths of a pizza for lunch. For dinner, he ate two-thirds of what was left from lunch. How much of the whole
Step2247 [10]
Answer: 5/12 of the whole pizza

So we start we the whole pizza = 1
Then he ate 3/8:
1 - 3/8
And then 2/3 of what was left:
2/3(1 - 3/8)
2/3 - 1/4
8/12 - 3/12
5/12
8 0
3 years ago
Complete the following <br> a) 3/5 = ?/20<br><br> b) ?/6 = 25=30
vlada-n [284]

Answer:

a) 3/5=12/20

b)5/6=25/30

8 0
3 years ago
Use inductive reasoning to predict the next three numbers in the pattern.
Mademuasel [1]

The next three numbers in the pattern would be 768, -3072, 12,288.

<h3>What are the next three numbers?</h3>

Looking at the given sequence, it can be seen that the numbers increase by a multiple of 4.

-12 /3 = 4

48 / 12 = 4

192 / 48 = 4

The next three numbers would be:

192 x 4 = 768

768 x 4 = 3072

3072 x 4 =  12,288.

Examining the numbers, it can be seen that the positive and negative signs alternate. Thus, the numbers would be : 768, -3072, 12,288.

To learn more about mathematical sequence, please check: brainly.com/question/26578277

#SPJ1

4 0
1 year ago
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