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2x^2– 7x+6=y
x=0 (karena sumbu y terletak di x=0)
substitusikan
2(0)^2-7(0)+6=y
0-0+6 = y
6 = y
jadi titik perpotongannya adalah (0,6)
2.
4^2 - 3
=16 - 3
=13
3.
1 . 2-3.32.42
27
= - 2668
=
=
4.
2x-6 > 3-x
2x-(-x) > 3+6
2x+x > 3+6
3x > 9
x > 3
6.
log 16+log 25 – log 4
= log (16*25/4) ---------> 16/4 = 4
= log (4*25)
= log 100
= 2
7.
y=2x - 7
y= x2 – 2x -3
substitusi y
2x - 7 = x^2 - 2x -3
0 = x^2 - 2x - 3 - 2x + 7
= x^2 - 4x + 4
= (x-2)(x-2)
<=> 0 = x - 2 dan 0 = x - 2
karena 2 faktornya sama, jadi kita pake 1 aja
0 = x - 2
0 + 2 = x
2 = x
8.
3x – y =1
x – 2y = -8
eliminasi
3x - y = 1
3x - 6y = -24 -
5y = 25
y = 25/5
= 5
substitusi y
3x - y = 1
3x - 5 = 1
3x = 1 + 5
= 6
x = 6 / 3
= 2
jadi, x, y = {2,5}