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Find the equation of a line which cuts the x-axis at a distance of 3 units to the left of the origin andhas a slope equal to -2?
y = mx + b
m = slope
y = -2x+b
when y = 0, x = -3
0 = -2(-3)+b
b = 6
y = -2x +6
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How is an equation equal?
An equation is equal if you have a math problem on each side of an equal sign.
How do you find the equation of a circle?
A circle is the locus of all points equidistant from a fixed point on the plane. The fixed point is called the centre of the circle and the equal distance is called the radius of the circle. We can derive the equation of the circle from the distance formula. Let O be the centre of the circle and r be the radius of the circle. Here the centre = Origin = (0, 0) and the radius = r units. The distance r = sqrt ((x-0)2 + (y-0)2) r = sqrt (x2 + y2) Squaring both the sides, we get x2 + y2 = r2 This is the equation of the circle with centre as Origin. If the centre point is some (h, k), then use the distance formula to find the radius r. The distance r = sqrt ((x-h)2 + (y-k)2) Squaring both sides, we get (x-h)2 + (y-k)2 = r2. This is the equation of the circle with centre as the point (h, k).
What is an equation called that doesn't have an equal sign?
If it doesn't have an equal sign, then it's not an equation.
Difference between expression and equation?
An expression has no equal sign whereas an equation does have an equal sign
When two sides of an equation are equal what phrase is used?
Equality. If they are ALWAYS equal then the equation is an identity.
