Answer:
70 = 10x + 35 is your equation (10x + 35 is your expression).
3 1/2 hr is the time needed.
Step-by-step explanation:
Let hours = x.
You need 70 bookmarks, you have 35 (constant number), and you make 10 bookmarks an hour (varys).
Set the equation:
70 = 10x + 35
Solve for x. Note the equal sign, what you do to one side, you do to the other. Do the opposite of PEMDAS. First subtract, then divide.
Subtract 35 from both sides:
70 (-35) = 10x + 35 (-35)
70 - 35 = 10x
35 = 10x
Isolate the variable (x). Divide 10 from both sides:
(35)/10 = (10x)/10
x = 35/10
x = 3.5
3 1/2 hours is your answer.
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