Solve the system by substitution.5x + 4y = 353x - 2y = 21
A. {(7, 0)}
B. {(6, 1)}
C. ?
D. {(7, 1)}
Answer: A
Mathematics
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Solve for the indicated variable.A = 2?a2, for a
A. a = 
B. a = 
C. a = 
D. a = 
Mathematics
Graph the level curves in the first octant at heights of 
and 
for the given equation.z = 2y - x2
A. 
B. 
C. 
D. 
Mathematics
Solve the problem.4(x + 1) - 4 ? 8 and 5(1 - x) + 46 > 6
A. (-?, 2] ? (9, ?) B. [2, 9) C. (-?, 2) ? [9, ?) D. (2, 9]
Mathematics
Indicate whether the equation illustrates the additive identity, commutative property of addition, associative property of addition, or additive inverse.0.8 + 0 = 0.8
A. Commutative property of addition B. Additive identity C. Associative property of addition D. Additive inverse
Mathematics