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Solve the simultaneous equations: 5x + y = 21, x - 3y = 9

Two equations 1) 5x + y = 21, 2) x - 3y = 9. Eliminate x or y by manipulating equations 1 or 2. Equation 3 = equation 2 x 5 = 5(x-3y) = 5(9) 3) 5x - 15y = 45. Equations 3 & 1 both have 5x's so we can sub...
JL
Answered by Jason L. • Maths tutor
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Simplify the boolean expression ¬(A.B)+A.

¬(A.B)+A -- given in question. =(¬A+¬B)+A -- using De Morgan's Law. =¬A+¬B+A -- can remove the brackets. =1+¬B -- using identity ¬A+A = 1.=1 -- using identity 1 + anything = 1.
Answered by • Computing tutor
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What role does motivation play in the workplace?

Motivation is the energy or drive that enables people to achieve organisational objectives. Without motivation employees would not be able to use their skills or abilities to achieve organisational goals. fu...
JF
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Que te gusta hacer en tu tiempo libre?

En mi tiempo libre, me gusta hacer muchas actividades. Por ejemplo, siempre he disfrutado practicar la esgrima y para mi es un deporte muy emocionante. Lo practico para mi equipo de universidad y representar...
SA
Answered by Sharjeel A. • Spanish tutor
4248 Views

Explain why the use of petrol and diesel cars may be a source of market failure. [15]

• define market failure i.e. when free market forces of supply and demand fail to produce the quantities of goods and services at prices which reflect marginal utilities OR fails to operate at market equilib...
Answered by • Economics tutor
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