Substitution method

X = 4
2x - 3y = -19

Answers

Answer 1

Answer: $\left\{\begin{array}{ccc}x=4\n2x-3y=-19\end{array}\right\n\left\{\begin{array}{ccc}x=4\n2\cdot4-3y=-19\end{array}\right\n\left\{\begin{array}{ccc}x=4\n8-3y=-19\end{array}\right\n\left\{\begin{array}{ccc}x=4\n-3y=-19-8\end{array}\right\n\left\{\begin{array}{ccc}x=4\n-3y=-27&/:(-3)\end{array}\right\n\left\{\begin{array}{ccc}x=4\ny=9\end{array}\right$

Answer 2

Answer: 2(4)-3y=-19
8-3y=-19
-3y=-27
y=9

Related Questions

Express the number in polar form 4 - 4i
Log3x-log3 (x − 8) = 2?
For what values of k does the equation x^2 - (5k+1)x + 9k^2 = 0 have real roots?
A taut string of length 10 inches is plucked at the center. The vibration travels along the string at a constant rate of c inches per millisecond in both directions. If x represents the position on the string from the left-most end, so that 0≤x≤10, which of the following equations can be used to find the location x of the vibration after 0.3 milliseconds? A. | x -5 | =0. 3 B. ∣cx−5∣=0.3 C. | x -0.3 | = 5 D. | x - 10 | =0.3c
Eloise needs to rent a car. She goes to the rental agency and finds out that she will have to pay a fee of $35 and then an additional $0.10 for every mile that she drives. How much will she have to pay if she drives 20 miles?A) $2 B) $33 C) $37 D) $55 E) $70

the band members sold 316 juice drinks for a fundraiser. they sold 52 more grape drinks than strawberry drinks. how many of each type of juice drink did they sell?

Answers

s+g=316 "s"=strawberry "g"=grape
g=52+s

plug in for "g" to find "s"
s+(52+s)=316
2s+52=316
2s=316-52
2s=264
s=264/2
s=132

find "g"
g=52+132
g=184

132 strawberry drinks and 284 grape drinks.

Simplify the expression. 7(3x + 5y) + 4y

Answers

=21x + 35y + 4y
= 21x + 39y

.31 is what in a fraction

Answers

To convert 0.31 into a fraction, use the place value system, where 0.31 is represented as 31/100.

To convert this decimal into a fraction,

Express the value of each digit in terms of its place value.

The given decimal number is .31

Write down the number as the numerator of the fraction: 31

Determine the denominator of the fraction based on the number of decimal places.

In this case, we have two decimal places,

So the denominator will be 100

Then the fraction is $(31)/(100)$

Simplify the fraction if possible.

In this case, the fraction 31/100 cannot be simplified further.

Hence, 0.31 as a fraction is $(31)/(100)$ .

To learn more about the fraction visit:

brainly.com/question/5454147

#SPJ4

the answer to this is 31/100

Which equation models the height, y, x seconds after firing?

Answers

i dont see any equations there

Charlie solved an equation, as shown below:Step 1: 5x = 30
Step 2: x = 30 – 5
Step 3: x = 25

Part A: Is Charlie's solution correct or incorrect? If the solution is incorrect, explain why it is incorrect and show the correct steps to solve the equation. (6 points)

Part B: How many solutions will this equation have? (4 points)

Answers

Part A: Charlie's answer is incorrect. Part B: There is only 1 solution for this equation.

What is a linear equation?

A linear equation is an equation that has the variable of the highest power of 1.

The standard form of a linear equation is of the form Ax + B = 0.

Charlie solved an equation;

Step 1: 5x = 30

Step 2: x = 30 – 5

Step 3: x = 25

Part A: Charlie's answer is incorrect.

In step 2 of Charlie's answer he subtracted 5 from each side. Since 5x is multiplication so, he must divide each side by 5 to get x by itself.

Step 1: 5x = 30

Step 2: x = 30/5

Step 3: x = 6

Part B: There is only 1 solution for this equation.

Learn more about linear equations;

brainly.com/question/10413253

#SPJ2

Part A: Charlie's answer is incorrect
In step 2 of Charlie's answer he subtracted 5 from each side. Since 5x is multiplication, he must DIVIDE each side by 5 to get x by itself. The problem should have worked out like this...

Step 1: 5x = 30
Step 2: x = 30/5
Step 3: x = 6

Part B: There is only 1 solution for this problem.

What is 20 percent of 70 plants