Trevor tutors french for $12 an hour and scoops ice cream for $8 an hour. he is going to work 20 hours this week. at least how many hours does he need to tutor to make more than $190? let x equal the number of hours he tutors and y be the number of hours he scoops ice cream.

at least how many hours does trevor need to tutor to make more than $190? express your answer as a decimal number.

the answer is 16 hours

Step-by-step explanation:

i just multiplied 12(the amount he gets from tutoring) and multiplied it by different numbers  to see which one gets him past $190

x = -3

y = -18

step-by-step explanation:

to solve by substitution, substitute one variable and solve for the other. then substitute again to find the remaining variable.

x-1/3(3x-9) = -3 since y=3x-9 substittute y.

x-1/3(3x-9)=-3

x + x +3 = -3

2x+3=-3

2x+3-3= -3-3

2x=-6

x=-3

substitute again into y=3x-9

y=3(-3)-9

y=-9-9

y=-18