The area of a trapezoid is given by the formula a=h/2(a+b)?

the formula would be A=(a+b)/2 x h

Step-by-step explanation:

Well, the formula for the are of a trapezoid is not A=h/2(a+b).

It is actually:

A = (a + b) / 2 * h.

$9.41

step-by-step explanation:

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