Can someone explain how to solve and graph this step-by-step?​

(x,y)=(2,1) where the two lines intercept
so for the first equation you go on the y line and dot -4 then count up 5 times then right 2 times since it’s rise over run
for the second line start at positive 3 on the y line then it’s -1/1 which is up once and left once cause of the negative

For pilar. 1 pack of sugar cookies are $5 and $3 for one pack of oat meal cookies

For Alyson. 1 pack of sugar cookies are $6 and $2 for 1 pack of oatmeal cookies