2x + 3y = 10
x + y = 7
what number should the equation x + y = 7 be multiplied by to eliminate y?

2

Step-by-step explanation:

2(2)=4

2(3) = 6

6+4 =10

$75.00

step-by-step explanation:

i = prt

i = 1,5000 * 0.025 * 2

i = 75

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15