Y and x vary directly. If the constant of variation is 1/2, then what is the value of y when x= -6
1 answer:
If x=-6, then y=-3
Further explanation:
Direct proportion means that if a quanitity increases the other quantity also increases and vice versa
The direct proportion is written as:
If y and x vary directly then
y∝x
y=kx
where k is the proportionality constant
If k=1/2 then the expression will be:
If x=-6, then y=-3
Keywords: Proportion, Constant
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The pyramid is built from four congruent triangles and one square as the base
We have the side of the square, so the area is = 10×10 = 100
We need the height of the triangle to work out its area. We can find out by using the height of the pyramid and half of the length of the side of the square.
Using the Pythagoras rule
Height of triangle =
Area of one triangle = 1/2×10×12=60
Surface area of the pyramid = 100 + (4×60) = 340 square inches
The pyramid is built from four congruent triangles and one square as the base
We have the side of the square, so the area is = 10×10 = 100
We need the height of the triangle to work out its area. We can find out by using the height of the pyramid and half of the length of the side of the square.
Using the Pythagoras rule
Height of triangle =
Area of one triangle = 1/2×10×12=60
Surface area of the pyramid = 100 + (4×60) = 340 square inches