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7 t-shirts and a hat costs £67.00
5 t-shirts and a hat costs £49.00.
How much does a t-shirt cost?
How much does a hat cost?

 Jan 6, 2020
 #1
avatar+19815 
+2

7t + h = 67

5t +h  = 49      subtract bottom eq from top

 

2t = 18      t = 9

 

5(t) + h = 49

5(9) + h = 49

45 + h = 49

h = 4                                 Edited for mistake Guest pointed out to me...Thanx !

 Jan 6, 2020
edited by ElectricPavlov  Jan 7, 2020
 #2
avatar
+1

shouldn't t be equal to 9, not 7?

Since 2= 18, then  = 9

 

so then:

5= 49

5(9) + = 49

45 + = 49

= 4

Guest Jan 7, 2020
 #3
avatar+106922 
0

EP just made a careless mistake, it is no big deal. 

It does not even detract from his answer since only the method is important.

Melody  Jan 7, 2020

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