Answer:
3× + 16 = 22.75
3× = 22.75 - 16
<u>3x</u><u> </u>= <u>6</u><u>.</u><u>75</u>
<u> </u><u> </u><u> </u><u> </u><u> </u><u> </u><u> </u>3 3
x = 2.25
Addition you add and in subtraction you subtract
Let x = speed of the first car
the second car is 12 km slower so the seconds car speed is x-12
they each drove 2 hours so 1st car = 2x
2nd car = 2(x-12)
they drove 360 km
so you have 2x + 2(x-12) = 360
solve for x
2x+2(x-12) = 360
2x + 2x-24 = 360
4x-24 = 360
4x = 384
x = 384/4
x = 96
1st car drove at 96 km per hour
slower car drove at 96-12 = 84 km per hour
Answer:
5/9 & -10/3
Step-by-step explanation:
Set each to 0 and solve:
9x-5 = 0
9x=5
x=5/9
6x+20=0
6x=-20
x=-20/6
x= -10/3 or -3 1/3
