4×7×25=tell what multiplication strategy to use
1 answer:
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Answer:
y = - 3
Step-by-step explanation:
Given
=
( cross- multiply )
9(y + 2) = 3y ← distribute left side
9y + 18 = 3y ( subtract 3y from both sides )
6y + 18 = 0 ( subtract 18 from both sides )
6y = - 18 ( divide both sides by 6 )
y = - 3
Answer:
Total number of points in the test = 100
Total number of items in the test = 40
Let number of items of 2 points be x and number of items of 3 points be y.
Now, using the given information the situation can be represented by using the following equations :
⇒ x + y = 40 .........(1)
⇒ 2x + 3y = 100 .........(2)
The matrix equation is :
By solving the equation (1) and equation (2), we get :
Solution : x = 20 and y = 20