Y= -4x + 15 y = 4x - 41 substitution

Substitute y = -4x + 15 to the equation y = 4x - 41:

-4x + 15 = 4x - 41        subtract 15 from both sides

-4x = 4x - 56       subtract 4x from both sides

-8x = -56       divide both sides by (-8)

x = 7

Put the value of x to the first equation:

y = -4(7) + 15

y = -28 + 15

y = -13

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.