Answer:
2x+78=5x+15
78-15=5x-2x
3x=63
x=21
Answer: Y = -x/2+2/3
1170 m²
Step-by-step explanation:
Parallelogram: 40 x 18 = 720
triangle: (50 x 18) / 2 = 450
total area: 720 + 450 = 1170