ajayrose
11.01.2020 •
Mathematics
Solve each system
1. -6x+9y=21
10x-3y=-23
2. 5x+6y=-18
y=-3x-3
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Ответ:
10x - 3y = -23 . . . (2)
(2) x 3 => 30x - 9y = -69 . . . (3)
(1) + (3) => 24x = -48 => x = -48/24 = -2
From (1), -6(-2) + 9y = 21 => 9y = 21 - 12 = 9 => y = 9/9 = 1
Threfoe, x = -2 and y = 1
Ответ:
silver + silver = silver
0.45x + 0.60(40-x) = 0.48*40
45x + 60*40 - 60x = 48*40
-15x = -12*40
x = (4/5)40
x = 32 lbs (amt of 45% slloy needed)
40-x = 8 lbs (amt of 60% alloy needed)