42 divided by 3 how many are in each group

Aclassmate 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.

The equation line of cd is y=-2x-2. write an equation of a line parallels to line cd in slope-intercept form that contains point (4,5)

The length of the shadow of a building is 120 meters, as shown below: building shadow 120 m what is the height of the building? (1 point)