7p+5q=-3, p=1
7Xp+5q=-3
7+5q=-3
5p=-10
p=-2
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7+5q = -3 5q = -3-7 5q =-10 q = -2
Look at it this way: If p = 1, then 7p = 7. What plus 7 equals -3? Adding 7 to -10 would equal -3, so all we have to figure out is what times 5 would equal -10. 5 times -2 would equal -10 so q equals -2.
8p+5 = 11+7p= 8p-7p = 11-5p = 6
14 + 6p = 6 + 7p 8 = p
7p + 2 = 5p + 8 7p - 5p = 8 - 2 2p = 6 p = 3