Provide an appropriate response.2x - 7y = -175x + 3y = 19If your friend were going to solve this system of equations by first eliminating y, what general suggestions would you make so your friend could start on this in a systematic way?
What will be an ideal response?
Answers may vary. One possibility: Multiply the first equation by 3, multiply the second equation by 7, and add the two resulting equations together. Solve the resulting equation for x. Substitute the solution for x into one of the original equations and solve for y. Finally, check your overall solution by substituting both values into the other original equation.
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Solve the problem.The number of gallons of water in a swimming pool t minutes after the pool has started to drain is 
How fast is the water running out at the end of 10 minutes?
A. 2500 gal/min B. 5000 gal/min C. 500 gal/min D. 1000 gal/min
Perform the indicated operation. Simplify the answer when possible.
+ 
A. 
B. 
C. 
D. 
Find all the first order partial derivatives for the following function.f(x, y) = (3x3y2 - 5)2
A. 
= 9x2y2; 
= 6x3y1
B. 
= 18x2y2(3x3y2 - 5); 
= 12x3y1(3x3y2 - 5)
C. 
= 12x3y1(3x3y2 - 5); 
= 18x2y2(3x3y2 - 5)
D. 
= 2(3x3y2 - 5); 
= 2(3x3y2 - 5)
Find the unknown value.What percent of 50 is 16?
A. 16% B. 60% C. 120% D. 32%