7. sylvia made a poster shaped like the triangle shown below. (1 point)
26 in.

what is the length of the third side of the triangle?

10
12 in.
14 in.
16 in.

 10 inches.

Step-by-step explanation:

Use the Pythagorean Theorem . c² = a² + b²

to find a², subtract b² from both sides

c² - b² = a²

26² - 24² = 10²

676 - 576 = 100

√100 = 10

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