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Solve for x and y, with x and y satisfying the equations x+4y=5 and 2x+2y=16.

x=9 y=-1
LS
Answered by Lucy S. • Maths tutor
4270 Views

Solve the simultaneous equations for x and y: 2x+4y=-12 and y=-x-2

From the question we have y = -x - 2 so we can sub in -x-2 everywhere there is a y in the first equation. The equation is then 2x+4(-x-2) = -12 expanding the brackets we get -2x-8=-12 which you can then rear...
DG
Answered by Daniel G. • Maths tutor
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Why was the Truman Doctrine significant?

The Truman Doctrine was an American initiative introduced in 1947, which marked a change of international policy from isolationism to containment. Introduced by President Truman in a speech to Congress, this...
CE
Answered by Ciara E. • History tutor
22959 Views

What is diffusion and what are the factors that influence the rate of diffusion? What are some of the ways diffusion is used in the body? What is it called when water is diffused through a semi permeable membrane?

Diffusion is the spreading out of particles of any substance in solution or of gas resulting in a net movement of an area of high concentration to an area of low concentration. Diffusion is key to the surviv...
PF
Answered by Phoebe F. • Biology tutor
7452 Views

Describe four characteristics of an efficient respiratory surface

Four characteristics of an efficient respiratory surface are: thin epithelium, large surface area, abundant capillaries, ventilation mechanism.
GR
Answered by Grace R. • Biology tutor
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