1. 3x + y = 15 y = 2x

Solving the following systems by using substitution
NEED HELP ASAP PLEASE

x = 3

Step-by-step explanation:

Plug in for Y :

3x + y = 15

3x + 2x = 15

Combine Like Terms:

3x + 2x = 5x

5x = 15

Divide:

x = 15 / 5

x = 3

infinitely many solutions

step-by-step explanation:

we have been given the equation;

2(2x + 3) = -4 + 2(2x + 5)

we need to determine the value of x.

2(2x + 3), we expand this expression to obtain 4x + 6

similarly 2(2x + 5) will become 4x + 10

now we have;

4x + 6 = -4 + 4x + 10

4x + 6 = 4x + 10 - 4

4x + 6 = 4x + 6

the expression on the left hand side is identical to the one on the right hand side. therefore, we are looking at just a single straight line whose equation is;

y = 4x + 6

consequently, we shall have infinitely many solutions

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step-by-step explanation: