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28. Cari yg sama variabelnya
5y – (-3y)= 8y
-3x – 5x = -8x
-4 – 7 = – 11
C. -8x + 8y – 11
29. D
2xp + 15x = 7x
X(2p + 15) = 7x
2p + 15 = 7
2p = 7 – 15
P = -4

5 *p = q
5 * -4 = q
q = – 20

30. A . 2y²