Answer:
Step 2 has error and step 4 has error.
Step-by-step explanation:
Here we can see that elimination method is applied to solve the system of equations for which -2 is multiplied both sides of equation first
-2(x+2y)=-2(10 which is correct
but in step 2
left side is -2x-4y and the right side is -10 which has to be -20 which makes this step wrong and this is the error made by student.
in Step 4 also ,value of the y has to be 5 but student plugged y =1 which is also error by student.
Correct solution is
-2x-4y= -20
2x+ 5y= 15
on adding ,we get
y = -5
plugging y =5 in equation x+2y= 10 ,we get x+2(-5) =10 ,we get x = 20
therefore (20,-5) is the solution
5x-3=7
isolate the unknown
add 3 to both sides
5x=10
divide by 5
x=2
Answer:
10
Step-by-step explanation:
Answer:
33 cards in total.
Step-by-step explanation: cards already made = <u>3</u>
cards she makes per hour = 5
therefore, no. of cards she makes in 6 hours = 5 x 6 = 30 +<u> 3</u> = 33 cards.
