4x+2y=20 -8x-3y=16 what is y

Answer:

y = 56

Explanation:

We label each of the given equations as follows;

4·x + 2·y = 20...(1)

-8·x - 3·y = 16...(2)

Therefore, we are given a simultaneous equation, question

We make 'x' the subject of both equations and equate the result to find the value of 'y' as follows;

For equation (1)

4·x + 2·y = 20

∴ x = (20 - 2·y)/4 = 5 - y/2

x =  5 - y/2

For equation (2), we have;

-8·x - 3·y = 16

∴ x = (16 + 3·y)/(-8) = -2 - 3·y/8

x = -2 - 3·y/8

Equating the two equations of 'x', gives;

5 - y/2 = -2 - 3·y/8

7 = y/2 - 3·y/8 = (4·y - 3·y)/8 = y/8

∴ 7 = y/8

y = 7 × 8 = 56

y = 56

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LEARNING ACTIVITY SHEET
Bantayan National High School
EIM 11- Summative Test for Q2 Week 3&4
Name:
Year and Section :
A. Direction: Select from he given choices the best answer. Write only the corresponding letter as your answer in the blank provided before the
number. Use this paper as your answer sheet.
1. It is used to test/check the continuity of the circuit.
a. Ohmmeter b. Ammeter c. Voltmetdewer d. Wattmeter
2. Is a physical device used to connect electronic test equipment to a device under test.
a. Test probes
b. Plug
c. Pen tester d. None of these
3. A device inserted to a convenience outlet to conduct electric current.
a. Plug b. Continuity tester c. Test light d. None of these
4. Is a stranded wire used to temporary wiring installation and commonly used in extension cord assembly.
a. Duplex cord
b. Plug
c. Bulb guard d. None of these
5. It is a pocket size tool used to test the line wire or circuit if there is a current in it.
a. Test light
b. Plug
c. Continuity tester d. None of these
6. An instrument used to measure the amount of electrical current intensity in a circuit.
a.) voltmeter b.)ammeter c.) micrometer d.) ohmmeter
7. A pocket-sized tool used to test the line wire or circuit if there is current in it.
a.) test light
b.) wire gauge
c.) ruler
d.) pull-push rule
8. A measuring tool used to measure the length of an object in centimeter in it.
a.) test light
b.) wire gauge
c.) ruler
d.) pull-push rule
9. It is used to measure the diameter of wires/ conductors in circular mils. It can measure small and big
sizes of wires and cables.
a.) voltmeter b.)ammeter c.) micrometer d.) ohmmeter
10. It is used to measure the voltage, resistance and current of a circuit. It is connected in parallel or series with the
circuit depending on what to measure.
a.) volt-ohm-milliameter b.) micrometer c.) ohmmeter d.) ammeter
11. It is a measuring tool used to measure length, width and thickness of short flat object and in sketching straight
linae​