The ratio of boys to girls in math classes is 3.5. If there are 130 girls in these classes, how many boys must there be?

The ratio of boys and girls =3:5

Let

Number of boys=3x

Number of girls =5x

The number of boys=3x

=3×26=78

Number of boys is 78.

fa tha first one you gonna add y to both sides

it look like this

x-y+y=6+y

x=y+6

therefore your answer is

x =y+6

fa tha second one

you gonna flip tha equation

it gonna look like x-4y=y

then add 4 to both sides

it gonna look like tha

x-4 +4 =y +4

so therefore tha answer is x=y+4

step-by-step explanation: