Solve by the substitution method.-7x + 8y = -31-5x + 2y = -37
A. {(9, 4)}
B. {(9, 5)}
C. {(8, 5)}
D. ?
Answer: A
You might also like to view...
Find all the second order partial derivatives of the given function.f(x, y) = x2 + y - ex+y
A. 
= 2 - y2ex+y; 
= -x2ex+y; 
= 
= - y2ex+y
B. 
= 2 - ex+y; 
= - ex+y; 
= 
= -ex+y
C. 
= 1 - ex+y; 
= - ex+y; 
= 
= -ex+y
D. 
= 2 + ex+y; 
= ex+y; 
= 
= ex+y
Solve the problem.The weight of a liquid varies directly as its volume V. If the weight of the liquid in a cubical container 
on a side is 81 g, find the weight of the liquid in a cubical container 5 cm on a side.
A. 375 g B. 15 g C. 110 g D. 125 g
Solve the problem.A camera costs $350. If the sales tax rate is 8%, how much tax is charged and what is the total price? Round your answers to the nearest cent.
A. $24.50, $374.50 B. $28.00, $378.00 C. $31.50, $381.50 D. $280.00, $630.00
Use the quadratic formula to solve the equation. Simplify any radicals.x2 + 6x + 7 = 0
A. {
± 3}
B. {-3 ± 
}
C. {3 ± 
}
D. {-1}