Questions:
- x + y = 3
2x + 4y = 8
Solution: __________ - x + 2y = 7
4x + 3y = 3
Solution: __________ - -4x + y = 3
5x - 2y = -9
Solution: __________ - 8x - 7y = -2
-2x - 3y = 10
Solution: __________ - 2x - 2y = 5
4x - 4y = 9
Solution: __________ - 2x + 7y = 2
4x + 2y = -2
Solution: __________ - 2x - y = 7
2x + 7y = 31
Solution: __________ - x - 2y = -4
4y = 2x + 8
Solution: __________
B. Tell whether it is more efficient to solve for x and then substitute for x or to solve for y and then substitute for y. Explain your reasoning. Then solve the system. - 9x - 3y = 15
x + 3y = -8
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Solution: __________ - x/2 + y = 6
x/4 + y/2 = 3
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Solution: __________
Answers:
- (2, 1)
- (-3, 5)
- (1, 7)
- (-2, -2)
- no solution
- (-3/4, 1/2)
- (5, 3)
- infinitely many solutions
- (1, -3)
- infinitely many solutions
Reference:
Complete Test Preparation for the GED Test 2014 by Steck-Vaughn