Multiply the first equation with (-1)
you should get this
-6r + 3t = -6
6r + 8t = -16
start to eliminate
11t = -22
divide by 11
t = -2
substitute
6r - 3(-2) = 6
6r + 6 = 6
6r = 6 - 6
6r = 0
r=0
I think the answer is C 1 2/3
Letter A
because we should add the two smaller number in the radical and if the sum equals to the other one. Then, it is a right triangle
