the total amount cost of 10 pillows and 15 pillow cases is £175. A pillow costs £6.50 more than a pillow case.how much does a pillow case cost?

Let p be cost of a pillow and c be cost of a case. Then

10p + 15c = 175

p = c + 6.5

Replace the p in the first equation using the second equation:

10(c + 6.5) + 15c = 175

25c + 65 = 175

25c = 110

c = 4.4

So a pillow case costs £4.40

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i have no idea