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