Collect the like terms
9x-5x=20
4x=20 divide both sided by 4
x=5
I would say the answer is c. only graph d ,, think of the line test to see if a graph is a function or not
30 and 13
x-y=17 and x+y=43
x=17+y and x=43-y, so 17+y=43-y
so y=13
43-13=30, so x=30 and y=13
Answer:
the time taken is 22 mins
