Mathematics, 20.05.2021 14:00 tfonarov

Solve using substitution
6x + 7y = - 1
x-y = 15

Answers: 3

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Answers

Answer from: mikkilynnpeace1982

(8, -7)

General Formulas and Concepts:

Pre-Algebra

Order of Operations: BPEMDAS

Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to Right

Distributive Property

Equality Properties

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

Algebra I

Coordinates (x, y)Terms/CoefficientsSolving systems of equations using substitution/elimination

Step-by-step explanation:

Step 1: Define Systems

6x + 7y = -1

x - y = 15

Step 2: Rewrite Systems

x - y = 15

[Addition Property of Equality] Isolate x: x = y + 15

Step 3: Solve for y

Substitution

Substitute in x [1st Equation]: 6(y + 15) + 7y = -1[Distributive Property] Distribute 6: 6y + 90 + 7y = -1Combine like terms: 13y + 90 = -1[Subtraction Property of Equality] Isolate y term: 13y = -91[Division Property of Equality] Isolate y: y = -7

Step 4: Solve for x

Substitute in y [2nd Equation]: x - (-7) = 15Simplify: x + 7 = 15[Subtraction Property of Equality] Isolate x: x = 8

Answer from: Quest

the answer is b. 60. each interior angle in 120, so the exterior angle must be 60 in order to add up to 180

step-by-step explanation:

Answer from: Quest

Dis the answer for this question

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Solve using substitution
6x + 7y = - 1
x-y = 15...

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