A restaurant had a total of 15 tables—some long rectangular tables and some round ones. Long tables can seat 6 people. Round tables can seat 3 people. On a busy evening, all 75 seats at the tables are occupied. How many long tables and round tables are there at the restaurant

step-by-step explanation:

graph using a few selected

x         y

-1       15

0         6

1         2.4

2       0.96

27 +27 or 27times 2=54

the diffrence is 0

option (a)

step-by-step explanation:

step 1:   take 2 number whose product equal to 25..

and sum of those two number are -10

step: 2 for example here if we take 5,5 are the number,,

5*5=25

and

5+5=10

but we need -10

so if we take   -5,-5

so -5*-5=25

and -5+(-5)=-10

s0

come the equation

replace -10x by these number

like -5x -5x+25

take common

x(x-5)-5(x-5)=0

(x-5)(x-5)=0