Answer:
x = 12
y = 9
12 coins of dimes
9 coins of quartes
Step-by-step explanation:
x ---> coins of dimes
y ---> coins of quartes
x + y = 21
0.1x + 0.25y = 3.45 * 100
x + y = 21 L1
10x + 25y = 345 L2
x = 21 - y
Reemplace in L2
10(21 - y) + 25y = 345
210 - 10y + 25y = 345
15y = 345 - 210
15y = 135
y = 9
x = 21 - y
x = 21 - 9
x = 12
The coordinates are (6,-9) (-12,-3) (0,-7)
you put 6 in the place of x to get 6+3y=-21 then you must take 6 away from each side to get 3y= -27 then divide each side by 3 so -27 divided by 3 is -9. do this for all of them! hope it helped!
Answer:
$13 or $7 off
Step-by-step explanation:
20-35%=13
So that means that it is $7 off and it is now $13
equivalent ratio's to 15:38
15 x 2 = 30
38 x 2 = 76
30:76 is equivalent to 15:38
15:38 x 3
15 x 3 = 45
38 x 3 = 114
45:114 is equivalent to 15:38
15:38 x 4
15 x 4 = 60
38 x 4 = 152
60:152 is equivalent to 15:38
Answer:
I think it would be y = 27.5
Step-by-step explanation:
If x = 120 and y = 55, and x=60, or half of 120, then y would be half of 55, or 27.5
