To solve this system by substitution, we must substitute in the value we are given for x in terms of y (the first equation) into the second equation. This is modeled below:
x = -8y - 15
2x + 5y = -8
2 (-8y - 15) + 5y = -8
Now, we should solve this new equation for y. To begin, we should use the distributive property to get rid of the parentheses on the left side of the equation and begin the simplification process.
-16y - 30 + 5y = -8
Next, we can combine like terms on the left side of the equation by adding together the two terms that both contain the variable y.
-11y - 30 = -8
Next, we should add 30 to both sides in order to move all of the constant (number) terms to the left side of the equation.
-11y = 22
After that, we should divide both sides of the equation by -11 in order to get the variable y alone.
y = -2
Now, we can substitute our value for y back into one of our original equations (it doesn't matter which one you choose; they will yield the same answer).
x = -8y - 15
x = -8(-2) - 15
To simplify, we should following the order of operations outlined by PEMDAS and compute the multiplication and then the subtraction.
x = 16 - 15
x = 1
Therefore, the answer to the system is x = 1 and y = -2, or (1,-2) when written as an ordered pair.
Hope this helps!
A+b > c as in the side lengths
Answer:
She took $30.50 to the mall originally
Step-by-step explanation:
Let us solve the problem step by step
∵ She spent $5.25 on earrings
∵ The price of the shirt is 3 times the price of the earrings
∴ The price of the shirt = 3 × 5.25 = 15.75
∴ She spent $15.75 on the shirt
Find her total spending in the mall by adding the prices of earrings and the shirt
∴ She spent = 5.25 + 15.75 = 21
∴ She spent $21 on the mall
∵ She came home with $9.50
∵ She spent $21 on the mall
- Add them to find her original amount of money
∴ She took = 21 + 9.50 = 30.50
∴ She took $30.50 to the mall originally