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2 years ago

how to solve quations using subsitution. The equation I need to solve is 2x+y=5 -3x+2y=17 please explain it in detail thank you

1 answer:

3 0

We have a system of 2 linear equations with 2 unknown, so we can solve it:
 2x + y = 5
-3x + 2y = 17
We'll use substitution, so lets solve for y in the first equation and substitute that in the second afterwards:
y = 5 - 2x
-3x + 2(5 - 2x) = 17
-3x + 10 - 4x = 17
-7x = 7
x = -1
then substitute in the original equation to find y:
y = 5 - 2x = 5 - 2(-1)
= 5 + 2
y = 7

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3 years ago

. In a triangle, the second angle measures twice the first, and the third

IRISSAK [1]

Answer:

First angle = x = 35°

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Step-by-step explanation:

Given : 

The second angle measures twice the first, and the third angle measures 5 more than the second.

Sum of angles = 180°

Solution : 

Let the first angle be x

According to the given question :

Second angles = 2x

Third angle = 2x + 5

we know that Sum of angles = 180°

Solving x value :

x + 2x + (2x+5) = 180°

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