we measured breaking distances of 13 four cylinder cars and found a mean of 132.5ft and a std dev of 5.8ft. For 12 six-cylinder cars, the mean was 136.3ft and the std dev was 9.7ft. use a 0.05 significance level, to test the claim that four-cylinder cars have a shorter average breaking distance than six-cylinder cars

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

asdasdsad

step-by-step explanation:

3

step-by-step explanation: