Question 1083725
<font color="black" face="times" size="4">
Answer: <font color=red>15 boys</font> in the class
Extra info: there are 19 girls (four more than the boys). Note how 15+19 = 34
-----------------------------------------------------------------------------
-----------------------------------------------------------------------------


Explanation:


Let
x = number of boys
y = number of girls


There are 34 students meaning that
x+y = 34


There are 4 more girls than boys, so
y = x+4


Plug the second equation into the first and solve for x
x+y = 34
x+x+4 = 34
2x+4 = 34
2x+4-4 = 34-4
2x = 30
2x/2 = 30/2
x = 15
There are 15 boys.


We have the answer so we can stop here. As extra bit of info, you can plug x = 15 into the equation y = x+4 to find the number of girls
y = x+4
y = 15+4
y = 19
There are 19 girls.

</font>