7.2 Substitutions
Flashcard
•
Mathematics
•
9th Grade
•
Practice Problem
•
Hard
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16 questions
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1.
FLASHCARD QUESTION
Front
What is substitution in solving systems of equations?
Back
Substitution is a method where one equation is solved for one variable, and that expression is substituted into the other equation.
2.
FLASHCARD QUESTION
Front
How do you solve for y in the equation y = 2x?
Back
To solve for y, simply multiply the value of x by 2.
3.
FLASHCARD QUESTION
Front
What does it mean if a system of equations has no solution?
Back
It means that the lines represented by the equations are parallel and never intersect.
4.
FLASHCARD QUESTION
Front
What does it mean if a system of equations has infinite solutions?
Back
It means that the equations represent the same line, and every point on that line is a solution.
5.
FLASHCARD QUESTION
Front
Solve the system by substitution: -5x - 4y = -9, y = 6.
Back
(-3, 6)
6.
FLASHCARD QUESTION
Front
Solve the system by substitution: y = 2x, x + y = 9.
Back
(3, 6)
7.
FLASHCARD QUESTION
Front
Solve the system by substitution: 3x - y = -8, x = -2.
Back
(-2, 2)
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