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20 questions
Solve the following systems of equations using substitution:
x = 6
y = 2x - 3
(6, 6)
(6, 9)
(9, 6)
(9, 9)
Solve the following systems of equations using substitution:
5x - 2y = 3
y = 2x
(6, 3)
(1, 2)
(3, 6)
(2, 1)
Which answer has a correct first step for this system:
3x + 3y = 3
y = 3x + 5
The variable is already isolated, so we've already solved the system.
The variable is already isolated for y, so we substitute it in the first equation and solve for x
3x + 3(3x + 5) = 3
Free sha vaca doo
The variable is already isolated for y, so we substitute it in the second equation and solve for x
y = 3(3x + 3y) = 3
Which is the best method to use?
y = 6x − 11
−2x − 3y = −7
Graphing
Substitution because a variable is isolated.
Elimination because both equations are in standard form.
What variable do you eliminate?
4x + 8y = 20
−4x + 2y = −30
X because they have opposite signs
Y because they have opposite signs
How many solutions does this system of equations have?
One solution
Infinitely many solutions
No solutions
Two solutions
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