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11111nata11111 [884]
3 years ago
8

How to solve this system of equation 3x + y= 17 and 4x + 2 y = 20

Mathematics
1 answer:
lana66690 [7]3 years ago
4 0
<span>3x + y= 17        (a)
4x + 2 y = 20    (b)

Multiply (a) by 2:

6x + 2y = 34   (a)
4x + 2y = 20   (b)

make:   (a) - (b)

2x = 14 -----> x =7

-------------------------------

Replace the value of x = 7 in one of anterior equation:

</span>3x + y= 17  
3 x 7 + y = 17
21 + y = 17
y = 17 - 21
y = -4
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