x + y = 9
x = 9 - y
2x - y = 0
2(9 - y) - y = 0
18 - 2y - y = 0
-3y = -18
y = 6
x = 9 - 6
x = 3
Answer:
the one on the left (the first one)
Step-by-step explanation:
find the base 1st then Height.You should be able to get your Area after doing those steps correctly