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5y - 4y = 19 - 7
y = 12
2. 7x + 3 = 5x + 9
7x - 5x = 9 - 3
2x = 6
x = 3
3. 3x - 2 < x + 4
= x = positif dan negatif 3
nilai x yang memenuhi x<3
4. K = a + 2b
42 = a + 2(5x-1)
42 = a + (10x-2)
a = 42 - (10x + 2)
= 44 -10x
ax = 44 / 10 = 4,4
jadi panjang sisi 4,4