A classmate thinks that solving a system by graphing gives an exact answer when the lines appear to cross at a grid point, but only an approximate answer when they don't. Explain why this isn't true.

This isn't true because the exact answer of a system is where the lines cross each other, not where they cross a grid.

whose power in the senate is equal to the power of the speaker of the house?

step-by-step explanation:

δabc ≅ δdcb by sas because

db ≅ ac . . given (side)

bc ≅ bc . . reflexive property (side)

∠dbc ≅ ∠ acb . . alternate interior angles where transversal bc crosses parallel lines bd and ac (included angle)