My math problem went from 10a+15=65 to 10a+15-15=65-15. Explain what happened in this step.

What is the equation of this graphed line? enter your answer in slope-intercept form in the box.

(05.08a)triangle abc is transformed to similar triangle a′b′c′ below: a coordinate plane is shown. triangle abc has vertices a at 2 comma 6, b at 2 comma 4, and c at 4 comma 4. triangle a prime b prime c prime has vertices a prime at 1 comma 3, b prime at 1 comma 2, and c prime at 2 comma 2. what is the scale factor of dilation? 1 over 2 1 over 3 1 over 4 1 over 5

Ten times the square of a non-zero number is eqaul to ninety times the number