1. <span>Let n = Tom's weight in pounds. m=</span>Jim's weight in pounds.
m=n - 30 m+n=210
We solve this by substitution: (n - 30)+n=210 2n-30=210 2n=210+30 2n=240 n=120 pounds weighs Tom m=120-30=90 pounds weighs Jim
2. Let n = the number of boys. g = the number of girls.
n+g=19 g=n+5
By substitution: n+(n+5)=19 2n+5=19 2n=19-5 2n=14 n=14:2 n=7 boys g=7+5=12 girls
3. Let n = the<span> shortest side</span> of the triangle each of the two sides that are equal in length=2n
<span>The perimeter=n+2n+2n=36 inches</span> 5n=36 n=7.2 inches is the shortest side of the triangle 2*7.2=14.4 inches is each of the two sides that are equal in length
