It is c because i believe so
Step-by-step explanation:
Given,
6x - 5y = 10.5 .............. (1)
5x - 3y = -2 .................. (2)
Multiplying eq (1) by 3 and (2) by 5 then subtracting,
18x - 15y = 31.5
(-) 25x - 15y = -10
-----------------------------
-7x = 41.5
x = - 41.5 / 7 = -83 / 14
Inserting the value of x in eq (2)
5 * (-83 / 14) - 3y = -2
y = -129 / 14
x = -83 /14 and y = -129 /14
Answer:
The answer to your question is:
1st Diego
2nd Diego and Elena ( both 15 days)
Step-by-step explanation:
Data
Lin 54 pages 270-page book 3 days
Diego 100 pages 320 page 4 days
Elena 160 pages 480 page 5 days
Process
Lin
54 pages ------------------- 3 days
270 page ----------------- x
x = (270 x 3) / 54
x = 15 days
Diego
100 pages ----------------- 4 days
320 -------------------- x
x = (320 x 4) / 100
x = 12.8 days
Elena
160 pages ------------------- 5 days
480 pages -------------------- x
x = (480 x 5) / 160
x = 15 days