4x - 2y = -20
7x + 2y = -2
1 answer:
Answer:
(-2, 6)
General Formulas and Concepts:
<u>Pre-Algebra</u>
Order of Operations: BPEMDAS Equality Properties <u>Algebra I</u>
Solving systems of equations using substitution/elimination Solving systems of equations by graphing Step-by-step explanation:
<u>Step 1: Define systems</u>
4x - 2y = -20
7x + 2y = -2
<u>Step 2: Rewrite systems</u>
4x - 2y = -20
Add 2y to both sides: 4x = 2y - 20 Divide 4 on both sides: x = 1/2y - 5
<u>Step 3: Redefine systems</u>
x = 1/2y - 5
7x + 2y = -2
<u>Step 4: Solve for </u><em><u>y</u></em>
<em>Substitution</em>
Substitute in <em>x</em>: 7(1/2y - 5) + 2y = =-2 Distribute 7: 7/2y - 35 + 2y = -2 Combine like terms: 11/2y - 35 = -2 Add 35 to both sides: 11/2y = 33 Isolate <em>y</em>: y = 6
<u>Step 5: Solve for </u><em><u>x</u></em>
Define original equation: 7x + 2y = -2 Substitute in <em>y</em>: 7x + 2(6) = -2 Multiply: 7x + 12 = -2 Subtract 12 on both sides: 7x = -14 Divide 7 on both sides: x = -2
<u>Step 6: Graph systems</u>
<em>Check the system.</em>
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have a good day friend :)