Solve for x. Pls explain your answer.

x = 8

Step-by-step explanation: The question shows two separate trapeziums DEFG and QRSP. In figure DEFG two sides and three angles are given. However, if we turn figure QRSP upside down, we can see that what we have is two similar trapeziums, DEFG and SPQR. Upon closer examination, we would see that line DE = line SP

Similarly line GF = line RQ

Also angle F = angle Q.

Having take note of these similarities, we can now express them as follows;

2x - 4 = 12 {i.e RQ = GF}

6y + x = 68 {i.e Q = F}

What we now have is a pair of simultaneous equations

2x - 4 = 12 ————(1)

6y + x =68 ————(2)

From equation (2)

x = 68 - 6y (by rearranging and making x the subject of the formula)

We can now substitute for the value of x into equation (1)

2x - 4 = 12

2(68 - 6y) - 4 = 12

By expanding the bracket, we now have

136 - 12y - 4 = 12

By regrouping and collecting like terms,

136 - 4 - 12 = 12y

Remember that if a negative number crosses to the other side of the equality sign, it becomes positive, and vice versa. Hence, negative 12y crosses to the right hand side of the equation and becomes positive 12y.

136 - 4 - 12 = 12y

120 = 12y

Divide both sides of the equation by 12

10 = y

Now we can substitute for the value of y = 10 into equation (2)

6y + x = 68

6(10) + x = 68

60 + x =68

Subtract 60 from both sides of the equation

x = 8.

answer: hence, function will be

explanation:

since we have given that

cost of a new textbook = $85

according to question, the resale value of a textbook decreases by 25% with each previous owner,

so, our function becomes,

here, y is the total value of the text book after x owners.

hence, function will be

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