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2 years ago

Solve each system of linear equations by elimination. X-6y=7 -x+6y= -7 -

Mathematics

1 answer:

ehidna [41]2 years ago

5 0

Answer:

Infinitely many solutions.

Step-by-step explanation:

x-6y=7

-x+6y=-7

--------------

0=0

infinitely many solutions.

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Help I cannot figure this question out.

netineya [11]

Answer:

B. x = -1 ± i

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Equality Properties

Multiplication Property of Equality
Division Property of Equality
Addition Property of Equality
Subtraction Property of Equality

Algebra I

Standard Form: ax² + bx + c = 0
Factoring
Quadratic Formula: $\displaystyle x=\frac{-b \pm \sqrt{b^2-4ac}}{2a}$

Algebra II

Imaginary Numbers: √-1 = i

Step-by-step explanation:

Step 1: Define

x² + 2x = -2

Step 2: Identify Variables

Rewrite Quadratic in Standard Form [Addition Property of Equality]: x² + 2x + 2 = 0
Break up Quadratic: a = 1, b = 2, c = 2

Step 3: Solve for x

Substitute in variables [Quadratic Formula]: $\displaystyle x=\frac{-2 \pm \sqrt{2^2-4(1)(2)}}{2(1)}$
[√Radical] Evaluate exponents: $\displaystyle x=\frac{-2 \pm \sqrt{4-4(1)(2)}}{2(1)}$
Multiply: $\displaystyle x=\frac{-2 \pm \sqrt{4-8}}{2}$
[√Radical] Subtract: $\displaystyle x=\frac{-2 \pm \sqrt{-4}}{2}$
[√Radical] Factor: $\displaystyle x=\frac{-2 \pm \sqrt{-1}\sqrt{4}}{2}$
[√Radicals] Simplify: $\displaystyle x=\frac{-2 \pm 2i}{2}$
Factor: $\displaystyle x=\frac{2(-1 \pm i)}{2}$
Divide: $\displaystyle x = -1 \pm i$

3 0

3 years ago

A tank was filled with 4 and half litres of water. 1.175 litres of water was poured out from the tank. How much water was left i

serg [7]

4-1.175=2.825
There was 2.825 liters left in the tank.
Hope this helps.

7 0

3 years ago

A teacher had 85 red grapes and 19 students. If each student received the same number of

nata0808 [166]

Divide 85 and 19.
85/19= 4.417....
So, we know that each student can’t have above 4. But, if each student has 4 grapes, 19x4 = 76.
85-76=9
There are 9 grapes left over.

7 0

3 years ago

Can I get help what does x equal?

MAXImum [283]

Answer:

X is equal to 5

Step-by-step explanation:

If DE is a midsegment of the triangle, then segments AD and DB are congruent, therefore they have the same value.

3 0

3 years ago

4. The balance in Tom's account was

MrRissso [65]

Answer:

His balance is $3778.28

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3 years ago

Solve each system of linear equations by elimination. X-6y=7 -x+6y= -7 -​

Solve each system of linear equations by elimination. X-6y=7 -x+6y= -7 -