Question

12H+N=210 & 9H+2N/3=155 N=NAILS H=HORSESHOES
HOW MANY NAILS WERE IN THE JOB THE BLACKSMITH COMPLETED?

Answer 1

well substitution looks easiest

take the 1st equation and make N the subject

N = 210 - 12H

then substitute into the 2nd equation..

distribute, collect like terms and solve for N

when you have N substitute into either equation to find H

hope this helps

Answer 2

Ok, you have to use the system of equation.

We know

equation 1=> 12H + N = 210
equation 2 => 9H + 2N/3 = 155

We have two unknowns H and N with 2 equations so, let's find one unknown first

Look at eq. 1 it has N alone so, it's easier to find the equation for N in terms of H

12H + N = 210
N = 210 - 12H

Now we have a new equation derived from equation 1. Let's use the new equation in Equation 2.

9H + 2N/3 = 155
9H + (2/3)(210 - 12H) = 155
9H + 140 - 8H = 155
H = 155 - 140
H = 15

Now, we have H and we can find N

N = 210 -12H = 210 - 12(15) = 30.

Let's check our answers using equation 1.

N = 30 , H = 15

12H + N = 210
12(15) + 30 = 210
210 = 210

Answer 3

thank you =)

Answer 4

lol... someone always gives the answer...