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受欢迎的代数 >

s-7t+42=0,s-3t=6

解答

s - 7 t + 42 = 0, s - 3 t = 6

解答

s = 42, t = 12

求解步骤

[s - 7 t + 42 = 0 s - 3 t = 6]

对于

s - 7 t + 42 = 0

将

s

移到一边:

s = 7 t - 42

替代

s = 7 t - 42

[7 t - 42 - 3 t = 6]

化简

[4 t - 42 = 6]

对于

4 t - 42 = 6

将

t

移到一边:

t = 12

对于

s = 7 t - 42

替代

t = 12

s = 7 \cdot 12 - 42

化简

s = 42

方程组的解为:

s = 42, t = 12

作图

流行的例子

x + y = 5, x - y = 1

2x-y+3z=13,x+2y+z=12,3x-y+z=7

2 x - y + 3 z = 13, x + 2 y + z = 12, 3 x - y + z = 7

9x+11y=-14,6x-5y=-34

9 x + 11 y = - 14, 6 x - 5 y = - 34

x + y = 3, 2 x - y = 0

3x+2y=14,5x-2y=2

3 x + 2 y = 14, 5 x - 2 y = 2