Question

what is x if 3x+5y=5 and -7x-5y=25

Answer 1

Value of x is $x=-\frac{15}{2}$

Step-by-step explanation:

We need to find the value of x, when we are given:

$3x+5y=5\,\,and\,\,-7x-5y=25$

Solving these equations, to find the value of x:

$3x+5y=5\,\,\,\,(1)\\-7x-5y=25\,\,\,\,(2)$

Adding eq(1) and eq(2)

$3x+5y=5\,\,\,\,(1)\\-7x-5y=25\,\,\,\,(2)\\-------\\-4x=30\\x=\frac{30}{-4}\\x=-\frac{15}{2}$

So, Value of x is $x=-\frac{15}{2}$

We can find value of y, by putting value of x in equation 1 or equation 2.

Keywords: System of Equations

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