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2x + 3y = 7
7x - y = 13 ----> x3
2x + 3y = 7
21x - 3y = 39
-------------------- +
23x = 46
x = 46/23
x = 2
*mencari nilai y:
2x + 3y = 7 ---> x7
7x - y = 13 ----> x2
14x + 21y = 49
14x - 2y = 26
----------------------- -
23y = 23
y = 23/23
y = 1
2.) mencari persamaan garis:
y - y1 x - x1
---------- = ------------
y2 - y1 x2 - x1
y - 5 x - 1
-------------- = -----------
5 - (-4) 1 - (-2)
y - 5 x - 1
----------- = ---------
9 3
3y - 15 = 9x -9
3y = 9x + 6
y = 3x + 2
karena y = ax + b, maka a=3 dan b=2
jadi nilai dari a pangkat b = 3 pangkat 2 = 9