If the family spent 151 dollars then how many people went?

y=21x+25

x=6

Step-by-step explanation:

151=21x+25

-25. -25

126=21x

÷21. ÷21

x=6

Step-by-step explanation:

The blue parabola is only a translated version of the red parabola. The standard form of a vertical parabola centered at (h,k), that is, a parabola whose axis of symmetry is parallel to y-axis, is of the form:

Where:

, - Horizontal and vertical components of the vertex with respect to origin, dimensionless.

- Vertex constant, dimensionless. (If C > 0, then vertex is an absolute minimum, but if C < 0, then vertex is an absolute maximum).

Since both parabolas have absolute minima and it is told that have the same shape, the vertex constant of the blue parabola is:

After a quick glance, the location of the vertex of the blue parabola with respect to the origin is:

The standard form of the blue parabola is . Its expanded form is obtained after expanding the algebraic expression and clearing the independent variable (y):

Then, the blue parabola is represented by the following equations: