Using substitution to solve the system below, what expression should be substituted into the first equation? 2x-4y=-4 and x+2y=8

Given the system of equation:

                   ......[1]

                     ......[2]

we can rewrite equation [2] as;

               ......[3]

Substitute equation [3] into [1] to eliminate x, and solve for y;

Using distributive property:

Combine like terms;

16 - 8y = -4

Add 4 to both sides we have;

20 - 8y = 0

Add 8y to both sides we have;

20 = 8y

Divide 8 to both sides we have;

Substitute the y-value in [3] we have;

x = 8 - 5 = 3

Therefore, the  expression should be substituted into the first equation is,  and also the value of x = 3 and y = 2.5

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step-by-step explanation:

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