Question 1173370
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Hi
Let x be a pizza's cost  and y the sandwich cost
 3x + 4y = $34
 3x + 7y = $41.50
Multiply 1st EQ by -1 to eliminate x
-3x - 4y = -34
<u> 3x + 7y = 41.50</u>
3y = 7.50
 y = $2.50   and  x = $8.00    {{{ 3x + 10 = 34}}}
Checking our answer
 3x + 7y = $41.50 = $24 + $17.50
  Wish You the Best in your Studies.