Get the unit rate.
90 / 12 = 7
$7.50 for a sun visor.
15 * 7.5 = 112.5
The athletic director needs to pay $112.5 to buy 15 more sun visors.
5x+3y=58
5x-3y=22
(3y gets cancelled bc 3y-3y=0, then add 5x with 5x, so you're left with)
10x=80, (divide both sides by 10)
x=8
Now we look for y. So choose one formula from the two (let's say 5x + 3y=58)
Substitute x for 8 so it will look like---- 5(8)+3y=58
Multiply 5*8--- so you get -- 40+3y=58
Subtract 40 from both sides and you're left with 3y=18
divide both sides by 3
you get y=6
In conclusion, x=8 and y=6 hence, (8,6)
Answer:
hello have a good night!!!!!
He could have wrote -2.5 or -3.
