X2 + 4x – 9

Can someone give me step by explanation for this vertex form question?

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.

If t8 = 4 and t12 = −2, find the first three terms of the arithmetic sequence.

If on=8x-8,lm=7x+4,nm=x-5,and ol=3y-6