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2x+3y = 15
2(-a)+3(3) = 15
-2a+9 = 15
-2a = 15-9
-2a = 6
a = -3
garis melalui titik (1,1) dan (4,4) memiliki gradien m,
m = (y₂-y₁) / (x₂-x₁)
= (4-1)/(4-1)
= 1
semoga membantu ya :)
y = 3
2x+3y = 15
2(-a) + 3(3) = 15
-2a + 9 = 15
-2a = 15-9
-2a = 6
a = 6/-2 = -3
maka -3a = -3(-3) = 9
2) pertama kita cari pers garis terlbih dahulu
(1,1) ---------> x1 = 1, y1 = 1
(4,4) ---------> x2 = 4, y2 = 4
a = 1
b = -1
gradien garis tsb adalah
m = -b/a = -(-1)/1 = 1