1 Solve the following system of equations by elimination: x + 2 y = 3 2 x + 2 y

Question

1

Solve the following system of equations by elimination: x+ 2y= 3
2x + 2y= 10.
A. x=7 y=-2 B. x= 7 y=2 C. x= 8 y=-1 D. x=8 y=3

2

Jose's math final is worth 100 points and consists of 45 testquestions. Multiple choice questions are worth 2 points andapplication questions are worth 4 points. How many applicationproblems are on the test?
A. 3
B. 5
C. 7
D. 9
1

Solve the following system of equations by elimination: x+ 2y= 3
2x + 2y= 10.
2

Jose's math final is worth 100 points and consists of 45 testquestions. Multiple choice questions are worth 2 points andapplication questions are worth 4 points. How many applicationproblems are on the test?
A. x=7 y=-2 B. x= 7 y=2 C. x= 8 y=-1 D. x=8 y=3

2

Jose's math final is worth 100 points and consists of 45 testquestions. Multiple choice questions are worth 2 points andapplication questions are worth 4 points. How many applicationproblems are on the test?
A. 3
B. 5
C. 7
D. 9

Explanation / Answer

(1)x + 2y= 3 --> 2x+4y=6.....(1) 2x + 2y= 10....(2) (1)-(2): 2y = -4              y= -2 x-2*2=3 --> x= 3+4=7 Answer:A. x=7 y= -2 ------------------------------------------------------------------------------------------------- (2)Jose had 5 application problems and 40 Multiple choiceproblems. 5 x 4 = 20, and 40 x 2 = 80 (20 + 80 = 100) So 5+2=7 Answer: C. 7

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