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3x + y = 3
2x + y = 4
y = 3 - 3x
2x + 3 - 3x = 4
y = 3 - 3x
2x - 3x = 4 -3
-x = 1 /(-1)
x = -1
y = 3 - 3x
y = 3 - 3 *(-1)
y = 3 + 3
y = 6
x = -1
y = 6
b)
-3x + 2y - 5 = 0
3y - 4x + 1 = 0
-3x + 2y = 5 /*4
-4x + 3y = -1 /*(-3)
-12x + 8y = 20
12x - 9y = 3
------------------------
- y = 23 /(-1)
y = -23
-3x + 2y = 5
-3x + 2*(-23) = 5
-3x - 46 = 5
-3x = 5 + 46
-3x = 51 /:(-3)
x = -17
x = -17
y = -23
c)
2x - y - 3 = 0
2x + 4y - 16 = 0
2x - y = 3 /*(-1)
2x + 4y = 16
-2x + y = -3
2x + 4y = 16
-------------------
5y = 13 /:5
y = 13/5
y = 2 3/5
2x + 4y = 16
2x + 4 * 13/5 = 16
2x + 52/5 = 16
2x = 16 -10 2/5
2x = 15 5/5 - 10 2/5
2x = 5 3/5 / : 2
x = 5 3/5 * 1/2
x = 28/5 * 1/2
x = 28/10
x = 2 8/10
x = 2 4/5
x = 2 4/5
y = 2 3/5
d)
2x + 3y = -18
y - 16 = 3x
2x + 3y = -18
-3x + y = 16
2x + 3y = -18
y= 16 + 3x
2x + 3 *(16 + 3x) = -18
2x + 48 + 9x = -18
2x + 9x = -18 - 48
11x = -66 /:11
x = -6
-3x + y = 16
-3 *(-6) + y = 16
y + 18 = 16
y = 16 - 18
y = -2
x = -6
y = -2