Answer:
Step-by-step explanation:
Y=9
28 + 7y =91
first subtract 28 from both sides
28-28+7y=91-28
7y= 63
then divide both sides by 7
7y/7=63/7
y=9
ANSWER CHECK
to see if the answer is correct substitute the answer you got for the variable
28 + 7(9)
multiply 7 and 9
7(9)=63
63+28= 91
850+5(x+17) (D)
153