3 years ago

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

1 answer:

4 0

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:

3x + y= 17
3 x 7 + y = 17
21 + y = 17
y = 17 - 21
y = -4

You might be interested in

If 2x + 3 = 17, then x = 7 2x + 3 = 17 Conclusion??

Elena L [17]

Plug in 7 for x:
2(7) + 3 =
Solve:
14 + 3 = 17
7 is a true answer for x

4 0

3 years ago

Given m∥n, find the value of x and y.

kupik [55]

X=2
y=149
————-
Solve 8x+15=7x+17
alternate angles are equal
x=2

Substitute 2 in 8x+15 =31
180-31=149
y=149
Angles on a straight line add up to 180

3 0

2 years ago

Miranda conducted a survey on how many hours per day students spend surfing the internet versus how many pets they have. She sur