Which system of linear equations has the ordered pair (4, –5) as a solution? a. 2x-5y=-30 and 7x+4y=-19 b. 6x-y=-29 and 8x+3y=-17 c. 3x-2y=22 and 2x+97=-37 d. 5x-6y=49 and x+8y=-27

Aheated piece of metal cools according to the function c(x) = (.5)x ? 7, where x is measured in hours. a device is added that aids in cooling according to the function h(x) = ? x ? 2. what will be the temperature of the metal after two hours?

Find the unit rate for: 75% high-fiber chimp food to 25% high -protein chimp food.

X/y + 4y/x divided by x/y - 2y/x explain as in depth as you can how you simplfied the fractions. i don't know where to start on this : /