7. suppose you earned 7t - 1 dollars on monday and 8t + 5 dollars on tuesday. what were your total earnings? simplify your answer. a. -t + 4 dollars b. -t - 6 dollars c. 15t - 6 dollars d. 15t + 4 dollars

earnings on monday - 7t - 1

earnings on tuesday - 8t + 5

total earnings = earnings on both monday and tuesday

we need to add the earnings on monday and tuesday

total earnings = 7t - 1 + 8t + 5

we bring the like terms together

= 7t + 8t - 1 + 5

since 7t and 8t are like terms we can add them and get 15t

-1 and +5 have different signs so we have to find the difference of the 2 numbers which is 5 -1 = 4 and the put the sign of the larger number (+5) , positive sign

answer is = 15t + 4

answer is d. 15t + 4

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