Solve the system.

6x - 2y + z = -2
2x + 3y – 3z = 11
х+ 6у = 31

After Multiplying 3 with the eq. (i) we will add this to eq. (ii)

After Multiplying 2 with the eq. (iv) we will add this to eq. (iii)

After putting the value of x in the eq. (iii)

After putting the value of x and y into eq. (i)

Hence,

step-by-step explanation:

option c) graph of line going through 1, 4 and 3, 10

step-by-step explanation:

let y equal to margo's coin collection

let x equal to number of years

at the begining x=0, y=1 → point=(x,y)→point=(0,1)

she adds 3 coins per year, then y=1+3x

at x=1, y=1+3(1)=1+3→y=4→point=(x,y)→point=(1,4)

at x=3, y=1+3(3)=1+9→y=10→point=(x,y)→point=(3,10)

the graph of line going through (1, 4) and (3, 10), then the option c is the correct.