Mathematics, 11.06.2021 06:00 Woodlandgirl14

Solve, using the substitution method
j+k=3
j-k=7

Answers: 3

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Answers

Answer from: shamarmosley

J= 5
k=-2
hope that helps

Answer from: HybridShadow3942

k = -2

j = 5

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

Terms/CoefficientsSolving systems of equations using substitution/elimination

Step-by-step explanation:

Step 1: Define Systems

j + k = 3

j - k = 7

Step 2: Rewrite Systems

j - k = 7

[Addition Property of Equality] Add k on both sides: j = 7 + k

Step 3: Redefine Systems

j + k = 3

j = 7 + k

Step 4: Solve for k

Substitution

Substitute in j [1st Equation]: 7 + k + k = 3[Addition] Combine like terms: 7 + 2k = 3[Subtraction Property of Equality] Subtract 7 on both sides: 2k = -4[Division Property of Equality] Divide 2 on both sides: k = -2

Step 5: Solve for k

Substitute in k [1st Equation]: j - 2 = 3[Addition Property of Equality] Add 2 on both sides: j = 5

Answer from: Quest

step-by-step explanation:

descending order means to order the polynomials from the term with the largest exponent to the term with the smallest exponent.

therefore, the correct answer is d.

Answer from: Quest

first, we define the variables:

x: number of years after 1950

f (x): amount of vinyl sold.

then, with the variables defined, we have:

68594 vinyl records were sold in 1958 > f (8) = 68594

91299 vinyl records were sold in 1961 > f (11) = 91299

38720 vinyl records were sold in 1952 > f (2) = 38720

161743 vinyl records were sold in 1967 > f (17) = 161743

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Solve, using the substitution method
j+k=3
j-k=7...

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