PLEASE HELP FAST! Solve for Y in the following system of equations!
1 answer:
Answer:
B.) 3
General Formulas and Concepts:
<u>Pre-Algebra</u>
Order of Operations: BPEMDAS
Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction
Equality Properties
<u>Algebra I</u>
Solving systems of equations using substitution/elimination Step-by-step explanation:
<u>Step 1: Define Systems</u>
x - y = -1
3x + 5y = 21
<u>Step 2: Rewrite Systems</u>
x - y = -1
Add <em>y</em> to both sides: x = y - 1
<u>Step 3: Redefine Systems</u>
x = y - 1
3x + 5y = 21
<u>Step 4: Solve for </u><em><u>y</u></em>
<em>Substitution</em>
Substitute in <em>x</em>: 3(y - 1) + 5y = 21 Distribute 3: 3y - 3 + 5y = 21 Combine like terms: 8y - 3 = 21 Add 3 to both sides: 8y = 24 Divide 8 on both sides: y = 3
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Answer:
x= 70
Step-by-step explanation:
In this question you have to use BODMAS. This indicates that you have to do the equation in the brackets first. Therefore, 3x15= 45. Then you add 25, which will give you 70.
As,
=0.301029+0.845098+1.13943
=2.26007
=2.260(approximate)