For systems of equations try using graphing, substitution, and elimination. For example
{2x+7y=3}
{x=-4y}
You should first look at if you have a variable that can be substituted (using substitution) and in this case we do! you plug in the x into 2x meaning 2(-4y)+7y=3
1) distribute -8y+7y=3
2) combine like terms in this case -8y+7y= -1y
3) solve -1y=3
y=-3
so currently our solution is (0,-3)
now we solve for x.
we plug our solved variable (y) into 7y
7(-3) and our equation looks like this
2x+7(-3)=3
1) distribute 7(-3)=-21
2) rewrite then solve 2x+(-21)=3
3) isolate variable -21+21 & 3+21
4) 2x=24
5) solve 2/24 = 12
Meaning our solution is (12,-3)
This is how to solve by substitution.
Answer:
He ended up with about 1 pound less grapes.
Step-by-step explanation:
Answer:
465.61 ft
Step-by-step explanation:
So what you're going to do is just multiply how you were normal to play multiply the numerator times the other numerator then multiply the denominator's and that should get you your answer and then you can try and simplify it by finding if it can be divided equally then see if it is bigger or smaller
Hello!
We need to get a number that is greater than or equal too 120. First of all, let's calculate the sales tax.
120(0.07)=8.4
120+8.4=128.4
This gives us the inequality below.
7.5w+44≥128.4
Now we solve like an equation.
7.5w≥84.4
84.4/7.5≈11.25
w≥11.25
As you can see, the only number greater than 11.25 is D) 12 weeks which is our answer.
I hope this helps!