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solve the simultaneous equation: 5x+y =21 and x-3y=9

5x+y=215x-15y=45 16y = -24 y = -1.5 5x -1.5 =215x=22.5x=4.5
CM
Answered by Caitlin M. • Maths tutor
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Describe the role of blood vessels in the control of body temperature.

Control of body temperature is called thermoregulation. One mechanism for thermoregulation is the control of blood vessels in the skin to either increase or decrease heat loss.If body temperature is too high...
EF
Answered by Eleanor F. • Biology tutor
12102 Views

Gemma wants to buy an equal number of pencils and rulers. Find how many of each she is able to purchase with £5. Use the price list below.

Price list:Pencils - 10p Rulers - 30pWe know Gemma would like to buy an equal number of pencils and rulers. Therefore we can call this a 1:1 ratio. Using the price list we can see that 1 ruler and 1 pencil w...
TM
Answered by Talha M. • Maths tutor
3666 Views

A rectangle is made up of the equations; For the longer spans: 5x-12y+16 and 5y-4x+20; for the shorter spans: 2x-4y+4 and 3x-2y-12

Initially solve for the longer spans through simultaneous equations;5x-12y+16=5y-4x+20Simplify equation;9x-17y-4=0Repeat for the shorter spans;2x-4y+4=3x-2y-12Simplify equation;x+2y-16=0Make x the subject;x=...
BM
Answered by Benedict M. • Maths tutor
3194 Views

y = (x+4)(6x-7). By differentiating, find the x coordinate of the maximum of this equation.

y=(x+4)(6x-7)y=6x 2 +17x-28dy\dx = 12x + 17To find the x coordinate of the stationary points of y, let dy\dx=012x+17=0x=-17\12
AS
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