Please Help Me ASAP.

Step-by-step explanation:

If y= x + 4 then plug it into the other equation where the y is. So 5x + x +4=22. Then solve.

for x                                                                              for y

5x + x + 4=22                                                               y=x +4

6x+4=22                                                                         y=3+4

22-4=18                                                                            y=7

6x = 18

18/6=3                                                      

x=3                                                         so, x=3 and y=7

answer: 204

step-by-step explanation:

we are told that the revenue is

x⋅(4080−10x)=−10x^2+4080x

this is a quadratic function, so to maximize it we should find the x-value of its vertex. recall that the x-value of the vertex of the parabola ax^2+bx+c is given by the formula −b/2a.

so in this case, we have a=−10 and b=4080, so the x-value of the vertex is

−b/2a= −(4080)/2(−10)=204