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Solve using Substitution Method

2x + 5y = 7
x = 2 - 4y

Step-by-step explanation:

2x + 5y = 7 Equation 1

x = 2 - 4y Equation 2

Substitute x that's equation 2 into equation 1 and solve for y

That's

2( 2 - 4y ) + 5y = 7

4 - 8y + 5y = 7

- 3y + 4 = 7

- 3y = 7 - 4

- 3y = 3

Divide both sides by - 3

y = - 1

Substitute the value of y into equation 1

That's

x = 2 - 4(-1)

x = 2 + 4

x = 6

Therefore the solutions are

Hope this helps you

2 over 5 and 4 over 15

don’t know last one sorry

step-by-step explanation:

i believe a. 12x≥120 is the answer