Tolong jawab sekarang semuanya ya
no. 1
y – y1 = m(x – x1)
y – 2 = -¾(x – 1)
y – 2 = -¾x + ¾
y = -¾x + ¾ + 2
y = -¾x + 11/4
atau
4y = -3x + 11
no. 2
f(x) = 7 – 3x
-8 = 7 – 3m
-8 – 7 = -3m
-15 = -3m
m = 5
f(x) = 7 – 3x
f(-2) = 7 – 3(-2)
f(-2) = 7 + 6
f(-2) = 13
nilai dari m – n
= m – n
= 5 – 13
= -8
no. 3
x² – 4x + 3 = 0
selisih akar akar :
x1 – x2 = √D/a
x1 – x2 = √ b² – 4ac/a
x1 – x2 = √ 16 – 12/1
x1 – x2 = √4/1
x1 – x2 = 2
no. 4
f(x) = ax² + bx + c
f(x) = 6 + x – x²
nilai maksimum :
-D/4a
= -(b² – 4ac)/4a
= -(1 – 4(-1)(6) / 4
= -(1 + 24)/4
= -25/4
no. 5
tegak lurus dengan gradien m = ½
m1.m2 = -1
½.m2 = -1
m2 = -1 : ½
m2 = -2
y – y1 = m(x – x1)
y – 3 = -2(x + 2)
y – 3 = -2x – 4
y = -2x – 1