Use the echelon method to solve the system.
+ 
= 4
- 2y = 21
A. (6, 8)
B. (6, -8)
C. (-6, 8)
D. (-6, -8)
Answer: B
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Perform the indicated arithmetic.1
? 7
A. 11 B. 7 C. 5 D. 12
Subtract.
- 
A. - 2
B. - 2
C. 1
D. - 4
Solve the system of equations by the elimination method. Check your solutions. For any dependent equations, write your answer in ordered pair form.
A. {(-4, 6)} B. ? C. {(-7, -5)} D. {(-5, 7)}
Write a system of equations for the problem, and then solve the system.Two different gasohol mixtures are available. One contains 5% alcohol and the other 12% alcohol. How much of each should be mixed to obtain 1250 gallons of gasohol containing 10% alcohol?Gallons of GasoholPercent (as decimal)Gallons of Pure Gasoholx0.05?y0.12?1250?0.10?
A. 521 gal 5%, 729 gal 12% B. 357 gal 5%, 893 gal 12% C. 63 gal 5%, 150 gal 12% D. 893 gal 5%, 893 gal 12%