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3x+y=-2        ...1)

-7x+5y=34     ...2)

Using the substitution method:

Rearrange equation 1):

y=-3x-2       ...1))

substitute equa...

To find the value of c, we need to find the value of x in the following: 4x - 7 = 9.

Add seven to both sides: 4x = 16

Divide by 4: x = 4

First, need to get all the terms in the equation to be the same. Using the following identity, it is possible to achieve this:

sin²(x) + cos²(x) = 1

1 ...

This equation is of the form ax² + bx + c = 0 (where a = 1, b = -8 and c = 15). To help solve it, find two numbers that add to give the value of b (the 'sum') and also when multiplied togeth...