The ratio of boy to girls was 3.7 if theres 200 more girls than boy in 2012 how many boys were enrolled that years

150 boys

Step-by-step explanation:

3:7, the difference is 200.

Within the ratio, the difference is 4.

Thus, 200 ÷ 4 = 50.

Boys = 3 × 50 = 150

Girls = 7 × 50 = 350

The ratio is now 150:350, when simplified is 3:7.

There were 150 boys.

Observe that the x coefficients are the same, whereas the y coefficients are opposite. This means that we can use elimation in two ways:

Method 1: SUM

If you sum the two equations, the opposite coefficients will cancel. The sum of the two equations is

Substitute this value for x in the first equation (for example) and you have

Method 1: SUBTRACT

If you subtract the two equations, the equal coefficients will cancel. The subtraction of the two equations is

Substitute this value for y in the first equation (for example) and you have