Let $\angle Q$ be an acute angle such that $\sin Q=0.91$ . Use a calculator to approximate the measure of $\angle Q$ to the nearest tenth of a degree.

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

- (2, -7)

- lines r and s and lines t and u must be parallel

i would say true? if the unit was informational and it "refreshed your understanding", then true.