Use the elimination method to solve this.

5x + y - z= 6
x+y+z=2
12x + 4y = 10

i already know how to use the method but i’m not sure what to do without that z in the 3rd equation

i think that you should ask google for the answer to that problem because if we don't know it google does

answer: its the third option.

step-by-step explanation:

i just took the test.

answer: - (a)

(b) 88 seats

step-by-step explanation:

given: in an auditorium, there are 22 seats in the first row and 28 seats in the second row.

thus first term=

second term=

the number of seats in a row continues to increase by 6 with each additional row.

⇒d= 6

a) given formula :

b)   let the number of seats (n) = 12

substitute n=12 in the explicit rule formed in (a)

∴there are 88 seats in 12 rows.