The sum of 2 numbers is 21 the second number is six times the first

Step-by-step explanation:

We can create two equations and solve the system of equations to find both the numbers. Let's represent the numbers as a and b.

We can create two equations:

We can now substitute the value of b (6a) into the first equation.

Combine like terms:

Divide both sides by 7:

Now we know the first number is 3. We can plug this value into one of the equations to find b. Let's plug it into .

So our numbers are 3 and 18.

Hope this helped!

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.