Answer:
b₁ = 2A/h -b₂
Explanation:
Given the formula for the area of a trapezoid, you want to solve it for b₁.
2-step equation
The given area equation can be solved for b₁ in two steps.
A = 1/2(b₁ +b₂)h . . . . . . . given
2A/h = b₁ +b₂ . . . . . . . . . multiply by 2/h
2A/h -b₂ = b₁ . . . . . . . . . subtract b₂
The equation for b₁ is ...
b₁ = 2A/h -b₂