At the beginning of the month, Evan had $24 in his account at the school bookstore. For each problem below, use a variable to represent the unknown amount in each equation you write. Remember, he he starting out with $24. 1.) First he bought some writing supplies that cost $16. Use "a", to represent his balance. *

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.

m∠a is 90°

m∠b is 40°