Solve the nonlinear system of equations by either using substitution or addition, be sure to show all of your work.
x-3y=-5
x^2+ y^2-25=0

The triangles are similar. what is the value of x? show your work.

Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.

To prove that angle def = angle dgf by sas, what additional information is needed? def congruent to dgf dfe congruent to dfg de congruent to dg dg congruent to gf