Worth 20 plzzz when y = 0, the equation becomes 0 = 230 – 45x. solve this equation for x. what does the solution represent?

Two angles are complementary. the large angle is 36 more than the smaller angle. what is the measure of the large angle?

Solve this riddle: i am an odd number. i an less than 100. the some of my digit is 12. i am a multiple of 15. what number am i?

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.