a ) 3 × x + 8 × y − 4 = 0 ; y = − 3 8 × x + 0.5 ; ( k ′ = − 1 k ) ; y = 8 3 × x + b ; − 9 = 8 3 × 8 + b ; b = − 9 − 64 3 = − 27 − 64 3 = − 91 3 ; y = 8 3 × x − 91 3 ; 3 × y = 8 × x − 91 ; − 8 × x + 3 × y + 91 = 0. a)3\times x+8\times y-4=0;\\
y=-\frac{3}{8}\times x+0.5;(k'=-\frac{1}{k});\\y=\frac{8}{3}\times x+b;\\-9=\frac{8}{3}\times 8+b;\\b=-9-\frac{64}{3}=\frac{-27-64}{3}=\frac{-91}{3};\\y=\frac{8}{3}\times x-\frac{91}{3};\\3\times y=8\times x-91;\\-8\times x+3\times y+91=0. a ) 3 × x + 8 × y − 4 = 0 ; y = − 8 3 × x + 0.5 ; ( k ′ = − k 1 ) ; y = 3 8 × x + b ; − 9 = 3 8 × 8 + b ; b = − 9 − 3 64 = 3 − 27 − 64 = 3 − 91 ; y = 3 8 × x − 3 91 ; 3 × y = 8 × x − 91 ; − 8 × x + 3 × y + 91 = 0.
Answer: a)− 8 × x + 3 × y + 91 = 0 -8\times x+3\times y+91=0\\ − 8 × x + 3 × y + 91 = 0
b ) d 1 = ∣ A × x + B × y + C ∣ A 2 + B 2 = ∣ 3 × 8 + 8 × ( − 9 ) − 4 ∣ 3 2 + 8 2 = 52 × 7 3 73 b)d_1=\frac{|A\times x+B\times y+C|}{\sqrt{A^2+B^2}}=\frac{|3\times 8+8\times (-9)-4|}{\sqrt{3^2+8^2}}=\frac{52\times\sqrt73}{73}\\ b ) d 1 = A 2 + B 2 ∣ A × x + B × y + C ∣ = 3 2 + 8 2 ∣3 × 8 + 8 × ( − 9 ) − 4∣ = 73 52 × 7 3
Answer:b ) b) b ) d 1 = 52 × 7 3 73 d_1=\frac{52\times\sqrt73}{73} d 1 = 73 52 × 7 3
c ) y = − 3 8 × x + 0.5 ; k = k ′ ′ ; y = − 3 8 × x + b ; 3 = − 3 8 × 4 + b ; b = 24 + 12 8 = 36 8 = 4.5 ; y = − 3 8 × x + 4.5 ; 8 × y + 3 × x − 4.5 = 0 ; 3 × x + 8 × y − 4.5 = 0 ; b ) d 2 = ∣ A × x + B × y + C ∣ A 2 + B 2 = ∣ 3 × 4 + 8 × 3 − 4 ∣ 3 2 + 8 2 = ∣ 12 + 24 − 4 ∣ 3 2 + 8 2 d 2 = 32 73 = 32 × 73 73 c)y=-\frac{3}{8}\times x+0.5;k=k'';\\y=-\frac{3}{8}\times x+b;\\3=-\frac{3}{8}\times 4+b;b=\frac{24+12}{8}=\frac{36}{8}=4.5;\\y=-\frac{3}{8}\times x+4.5;8\times y+3\times x-4.5=0;\\3\times x+8\times y-4.5=0;\\b)d_2=\frac{|A\times x+B\times y+C|}{\sqrt{A^2+B^2}}=\frac{|3\times 4+8\times3-4|}{\sqrt{3^2+8^2}}=\frac{|12+24-4|}{\sqrt{3^2+8^2}}\\d_2=\frac{32}{\sqrt{73}}=\frac{32\times\sqrt{73} }{73} c ) y = − 8 3 × x + 0.5 ; k = k ′′ ; y = − 8 3 × x + b ; 3 = − 8 3 × 4 + b ; b = 8 24 + 12 = 8 36 = 4.5 ; y = − 8 3 × x + 4.5 ; 8 × y + 3 × x − 4.5 = 0 ; 3 × x + 8 × y − 4.5 = 0 ; b ) d 2 = A 2 + B 2 ∣ A × x + B × y + C ∣ = 3 2 + 8 2 ∣3 × 4 + 8 × 3 − 4∣ = 3 2 + 8 2 ∣12 + 24 − 4∣ d 2 = 73 32 = 73 32 × 73
Answer:
c ) y = − 3 8 × x + 4.5 ; 3 × x + 8 × y − 4.5 = 0 ; d 2 = 32 × 73 73 c)y=-\frac{3}{8}\times x+4.5;\;\\3\times x+8\times y-4.5=0;\\d_2=\frac{32\times\sqrt{73} }{73} c ) y = − 8 3 × x + 4.5 ; 3 × x + 8 × y − 4.5 = 0 ; d 2 = 73 32 × 73
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