Solve this system of equation using the substitution method

2x + y = 5

y = x - 4

Step-by-step explanation:

We are asked to solve this system of equations using substitution:

Since y is equal to x-4, we can substitute x-4 in the top equation.

Combine the like terms on the left side of the equation. 2x and x both have the variable x and can be added.

Now, solve for x by isolating the variable. 4 is being subtracted and the inverse of subtraction is addition. Add 4 to both sides.

x is being multiplied by 3 and the inverse of multiplication is division. Divide both sides by 3.

x is equal to 3. Substitute 3 back into the bottom equation to find y.

Points are written as (x,y). The solution to this system of equations is (3, -1).

answer set (b) 0.5, 3/4 80% is in order from least to greatest.  

step-by-step explanation:

in order to compare rational numbers to each other, it is much easier if they are in the same form.   typically, the best form in which to evaluate rational numbers is in decimals.   in order to convert a percent to a decimal, you would divide the given percentage by 100.   you can also accomplish the conversion by moving the decimal point over two places to the left.   for example, the decimal value of 80% is 80/100, or 0.8.   in order to convert a fraction to a decimal, you need to divide the numerator by the denominator.   for example, 3/4 is 0.75.   so, for choice (b) 0.5 3/4 (0.75), 80% (0.8) is the only choice in which the numbers are in order from least to greatest.  

-7/8

step-by-step explanation:

instead of subtracting you add the -6/8 and -1/8