Which law would you use to simplify the expression ?

Can someone check if i did this right since i really want to make sure it’s correct. if you do you so much

Which statements about the system are true? check all that apply. y =1/3 x – 4 3y – x = –7 the system has one solution. the system consists of parallel lines. both lines have the same slope. both lines have the same y–intercept. the equations represent the same line. the lines intersect.

Given: m zade = 60° and m2cdf = (3x + 15) prove: x = 15