8y-2d=0 5y+4d=26 1/4
2 answers:
Answer:
y = 1
d = 4
Step-by-step explanation:
8y - 2d = 0 ---------------(I)
5y + 4d = 26 1/4
5y + 4d = 105/4 ------------------(II)
(I)*2 16y - 4d = 0
(II) <u>5y + 4d = 105/4</u> {add (I) &(II)}
21y = 105/4
Substitute y =1 in equation (I)
8*1 - 2d = 0
8 - 2d = 0
-2d = -8
d = -8/-2
d = 4
Answer:
(y, d) = (1.25, 5)
Step-by-step explanation:
We can add twice the first equation to the second.
2(8y -2d) +(5y +4d) = 2(0) +26 1/4
21y = 26 1/4
y = (105/4)/21 = 105/84 = 5/4
8(5/4) -2d = 0
5 = d . . . . . . . . . . add 2d, divide by 2
The solution to this system of equations is ...
y = 5/4, d = 5
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