Karla is given the equation 10x + 15 = 20 to solve. She says the solution is 12
.
Which reason justifies her solution?
Responses
A Karla says that to solve the equation you first add 15 and then multiply by 10.Karla says that to solve the equation you first add 15 and then multiply by 10.
B Karla says that to solve the equation you first multiply by 10 and then add 15.Karla says that to solve the equation you first multiply by 10 and then add 15.
C Karla says that to solve the equation you first subtract 15 and then divide by 10.Karla says that to solve the equation you first subtract 15 and then divide by 10.
D Karla says that to solve the equation you first divide by 10 and then subtract 15.Karla says that to solve the equation you first divide by 10 and then subtract 15.
A Karla says that to solve the equation you first add 15 and then multiply by 10.
Solve the equation for x.
−1/5x + 3 = −7
Responses
A x = −35
x = −35
B x = 15x = 15
C x = 50x = 50
D x = 55
A x = −35
Solve the equation for x.
−1/5x + 3 = −7
Responses
A x = −35
B x = 15
C x = 50
D x = 55
To solve the equation -1/5x + 3 = -7 for x, you first need to isolate the variable x by getting rid of the constant term and the coefficient of x.
Subtract 3 from both sides of the equation:
-1/5x = -7 - 3
-1/5x = -10
To solve for x, multiply both sides of the equation by -5:
(-5)(-1/5x) = (-5)(-10)
x = 50
The solution is x = 50.
Therefore, the correct response is C x = 50.
2x + 5 = 10
What is the first operation used in solving this equation?
Responses
The first operation used in solving the equation 2x + 5 = 10 is subtraction.
Solve.
4 - 2x = 10