a) 8y+5y-9y-7y+8=-3y+8=-3×(-18)+8=54+8=62
b) 20a-15b-10a+12+6b=10a-9b+12=10×(-3)-9×7+12=-30-56+12=-76
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a) 8y+5y-9y-7y+8=-3y+8=-3×(-18)+8=54+8=62
b) 20a-15b-10a+12+6b=10a-9b+12=10×(-3)-9×7+12=-30-56+12=-76